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100 - 7 . ( x - 5 ) = 58
93 . x - 5 = 58
x - 5 =93 : 58
x - 5 = 1.6
x = 1.6 +5
x = 6.6
100-7.(x-5)=58
7.(x-5)=100-58
7.(x-5)=42
x-5=42:7
x-5=7
x=7+5
x=12
vậy x=12
a ) 100-7(x-5)=58
=> 7(x-5)=42
=.> x-5 = 6
=> x=11
180-5(x+1)=30
=> 5(x+1)=150
=> x+1=30\
=> x=29
6x-5=613
=> 6x=618
=> x=103
a) \(100-7\left(x-5\right)=58\)
\(\Leftrightarrow7\left(x-5\right)=42\)
\(\Leftrightarrow x-5=6\)
\(\Leftrightarrow x=11\)
b) \(180-5\left(x+1\right)=30\)
\(\Leftrightarrow5\left(x+1\right)=150\)
\(\Leftrightarrow x+1=30\)
\(\Leftrightarrow x=29\)
c) \(6x-5=613\)
\(\Leftrightarrow6x=618\)
\(\Leftrightarrow x=103\)
\(a,565-\left(6x+70\right)=435\)
\(6x+70=565-435\)
\(6x+70=130\)
\(6x=130-70\)
\(6x=60\)
\(x=10\)
\(b,100-7\left(x-5\right)=58\)
\(100-7x+35=58\)
\(100-7x=58-35\)
\(100-7x=23\)
\(7x=100-23\)
\(7x=77\)
\(x=11\)
a, 565-(6x+70)=435
6x+70=565-435
6x+70=130
6x=130-70
6x=60
x=60:6
x=6
b, 100-7(x-5)=58
7(x-5)=100-58
7(x-5)=42
x-5=42:7
x-5=6
x=6+5
x=11
\(3.\left(x-2\right)+1=25\Leftrightarrow\left(x-2\right)=8\Leftrightarrow x=10\)
a: Ta có: \(100-7\left(x-5\right)=58\)
\(\Leftrightarrow7\left(x-5\right)=42\)
\(\Leftrightarrow x-5=6\)
hay x=11
b: Ta có: \(12\left(x-1\right):3=4^3+2^3\)
\(\Leftrightarrow12\left(x-1\right)=216\)
\(\Leftrightarrow x-1=18\)
hay x=19
x-5 = 58-100
x-5 = -42
x = (-42) + 5
x = -37
Vậy x = -37
HT
(x-5)=58-100
x-5=-42
x=-42+5
x=-37