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\(-4+x=-4+7\)
\(\Rightarrow x=-4+7+4\)
\(\Rightarrow x=7\)
\(\left(-3\right)-\left(-5-x\right)=-15+\left(-6+15\right)\)
\(\Rightarrow x=-15-6+15+3-5\)
\(\Rightarrow x=-8\)
\(-\left(x+2\right)+2=\left(8-15\right)+15\)
\(\Rightarrow-x+2+2=-7+15\)
\(\Rightarrow-x=-7+15-2-2\)
\(\Rightarrow x=-4\)
\(4+\left(x-4\right)=-\left(11-2\right)+\left(11+4\right)\)
\(\Rightarrow4+x-4=-11+2+11+4\)
\(\Rightarrow x=-11+2+11+4-4+4\)
\(\Rightarrow x=6\)
a) -4 + x = -4 + 7 b) (-3) - (-5-x) = -15 + (-6+15)
-4 + x + 4 - 7 = 0 (-3) + 5 + x = -6
x - 7 = 0 2 + 6 = -x
x= 7 8 = -x
Vậy x= 7 x= -8 =) Vậy x= -8
c) -(x+2)+2=(8-15)+15 d) 4+(x-4)= -(11-2) + (11+4 )
-x - 2 + 2 = 8 4+x-4 = 6
-x = 8 x=6
x= -8 Vậy x=6
Vậy x= -8

11 . 18 = 11 . 9 . 2 = 6 . 3 . 11
15 . 45 = 43 . 5 . 6 = 3 . 5 . 15

Bài 7:
a, \(x\) = \(\dfrac{1}{5}\) + \(\dfrac{2}{11}\)
\(x\) = \(\dfrac{11}{55}\) + \(\dfrac{10}{55}\)
\(x=\dfrac{21}{55}\)
b, \(\dfrac{x}{15}\) = \(\dfrac{3}{5}\) - \(\dfrac{2}{3}\)
\(\dfrac{x}{15}\) = \(\dfrac{9}{15}\) - \(\dfrac{10}{15}\)
\(\dfrac{x}{15}\) = \(\dfrac{1}{15}\)
\(x\) = 1
c, \(\dfrac{11}{8}\) + \(\dfrac{13}{6}\)= \(\dfrac{85}{x}\)
\(\dfrac{33}{24}\) + \(\dfrac{52}{24}\) = \(\dfrac{85}{x}\)
\(\dfrac{85}{24}\) = \(\dfrac{85}{x}\)
24 = \(x\)

4.(x-3)-(11+x)=58
4x-3-11-x=58
4x-x=58+3+11
3x=72
x=72:3
x=24
vậy x=24
4(x-11)-2(3x)=15-x
4x-44-6x=15-x
4x-6x+x=15+44
-x=59
x=-59
vậy x=-59
b) ghi thiếu đề rui
\(4.\left(x-3\right)-\left(11+x\right)=58\)
\(4x-12-11-x=58\)
\(3x-23=58\)
\(x=27\)
câu b) tương tự nha
c) \(4x-44-6x=15-x\)
\(-44-2x=15-x\)
\(-44=15-x+2x\)
\(-44=15+x\)
\(x=-59\)

a) Ta có: \(3\left(x+5\right)-3=2\left(x+1\right)+7\)
\(\Leftrightarrow3x+15-3=2x+2+7\)
\(\Leftrightarrow3x+12=2x+9\)
hay x=-3
b) Ta có: \(15-\left(x+2\right)^2=-1\)
\(\Leftrightarrow\left(x+2\right)^2=16\)
\(\Leftrightarrow\left[{}\begin{matrix}x+2=4\\x+2=-4\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=2\\x=-6\end{matrix}\right.\)
c) Ta có: \(75-\left(2x+1\right)^3=11\)
\(\Leftrightarrow\left(2x+1\right)^3=64\)
\(\Leftrightarrow2x+1=4\)
hay \(x=\dfrac{3}{2}\)
a) Ta có: 3(x+5)−3=2(x+1)+73(x+5)−3=2(x+1)+7
⇔3x+15−3=2x+2+7⇔3x+15−3=2x+2+7
⇔3x+12=2x+9⇔3x+12=2x+9
hay x=-3
b) Ta có: 15−(x+2)2=−115−(x+2)2=−1
⇔(x+2)2=16⇔(x+2)2=16
⇔[x+2=4x+2=−4⇔[x=2x=−6⇔[x+2=4x+2=−4⇔[x=2x=−6
c) Ta có: 75−(2x+1)3

`3(x+5)-3=2(x+1)+7`
`3x+15-3=2x+2+7`
`x=-3`
.
`15-(x+2)^2=-1`
`(x+2)^2=16`
`(x+2)^2=4^2=(-4)^2`
`[(x+2=4),(x+2=-4):}`
`[(x=2),(x=-6):}`
.
`75-(2x+1)^3=11`
`(2x+1)^3=64`
`(2x+1)^2=4^3`
`2x+1=4`
`x=3/2`
3(x+5)−3=2(x+1)+73(x+5)-3=2(x+1)+7
3x+15−3=2x+2+73x+15-3=2x+2+7
x=−3x=-3
.
15−(x+2)2=−115-(x+2)2=-1
(x+2)2=16(x+2)2=16
(x+2)2=42=(−4)2(x+2)2=42=(-4)2
[x+2=4x+2=−4[x+2=4x+2=-4
[x=2x=−6

\(\Leftrightarrow\dfrac{5}{4}\left(\dfrac{4}{3\cdot7}+\dfrac{4}{7\cdot11}+...+\dfrac{4}{x\left(x+4\right)}\right)=\dfrac{50}{123}\)
=>(1/3-1/7+1/7-1/11+...+1/x-1/x+4)=50/123:5/4=50/123*4/5=40/123
=>1/3-1/x+4=40/123
=>1/x+4=1/123
=>x+4=123
=>x=119
\(\frac{2}{5}+x=\frac{-11}{15}\)
\(x=\frac{-11}{15}-\frac{2}{5}\)
\(x=\frac{-11}{15}-\frac{6}{15}\)
\(x=\frac{-17}{15}\)
\(\frac{2}{5}+x=\frac{-11}{15}\)
\(x=\frac{-11}{15}-\frac{2}{5}\)
\(x=\frac{-11}{15}-\frac{6}{15}\)
\(x=\frac{-17}{15}\)
Vậy \(x=\frac{-17}{15}\)