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x - 17 = 2 x 17 x 5
=> X - 17 = 170
=> x = 187
49 - x = 21 x 63 + 37 x 3 x 7
=> 49 - x = 21( 63 + 37)
=> 49 - x = 2100
=> x = - 2051
2x + 3x = 15
=> 5x = 15
=> x = 3

[ -3x +21 ] [ 5 .| x | - 15 ] =0
<=> (-3x+21)=0 hoặc (5|x|-15)=0
<=> x=7 hoặc |x|=3
<=> x={7;-3;3}

a) x-15+124=200
x-15=200-124
x-15=76
x=76+15
x=91
Vậy x=91.
b) 3x-21=36:34
3x-21=32
3x-21=9
3x=9+21
3x=30
x=30:3
x=10
Vậy x=10.
c) x-48:16=21
x-3=21
x=21+3
x=24
Vậy x=24.

dài quá làm hộ câu 1-5 thoy
1) x=21-13
x=8
2)x=-55+41
x=-14
3)x=-21+15
x=-6
4)x=3-3
x=0
5) x= -98-37
x=-135
15 ) 57 - ( x - 46 ) = - 13
57 - x + 46 = -13
103 - x = -13
x = 103 + 13
x = 116
16 ) -x - 23 = -38 - 42
- ( x + 23 )=- ( 38 + 42)
x + 23 = 38 + 42
x = 38 + 42 -23
x = 57
17 ) x - ( - 7 ) = -4 – 14
X + 7 = -18
X = -18-7
X = -25
18 ) 18 - x = -8 - ( - 15 )
18 – x = 7
X = 18 – 7
X = 11
19 ) 45 - ( x + 17 ) = - 26
45 – x - 17 = -26
28 – x = -26
X = 28 + 26
X = 54
20 ) 3. ( x + 5 ) - x - 11 = 24
3x +15 –x – 11 = 24
2x + 4 =24
2x = 24 – 4
2x = 20
X = 20 : 2
X = 10
21 ) 14 - ( x - 7 ) = - 8 - ( - 9 )
14 – x + 7 = 1
21 – x = 1
X = 21 – 1
X = 20
22 ) 15 - ( x - 2 ) = - 7 + 8
15 – x + 2 = 1
17 – x = 1
X = 17 – 1
X = 16
6) x + ( - 71 ) = ( - 55 ) + 85
X – 71 = 30
X = 30 + 71
X = 101
7 ) x - ( - 45 ) = - 63 + 27
X +45 = -16
X = -16 -45
X = - 61

a, 2x -(-17) = 15
2x + 17 = 15
2x = 15 - 17
2x =(-2)
x = (-2) : 2
x = (-1)

a)15-(x-7)=-21
=>x-7=15-(-21)
=>x-7=15+21
=>x-7=36
=>x=36+7
=>x=43
b)(17-x)-12=16
=>17-x=16+12
=>17-x=28
=>x=17-28
=>x=-11
c)2x-35=15
=>2x=15+35
=>2x=50
=>x=50:2
=>x=25
d)3x+17=2
=>3x=2-17
=>3x=-15
=>x-15:3
=>x=-5
e)x-1=0
x=0+1
x=1

x - 7 = 15 - (-21)
x - 7 = 36
x = 36 + 7
x = 43
b) 3x + 17 = 2
3x = 2 - 17
3x = -15
x = -5
c) ( x - 9) = 45 - ( -35)
x - 9 = 80
x = 80 + 9
x = 89
a/ \(15-\left(x-7\right)=-21\)
\(15-x+7=-21\)
\(x=15-\left[\left(-21\right)-7\right]=15-\left(-28\right)=43\)
b/\(3x+17=2\)
\(3x=2-17=-15\)
\(x=-\frac{15}{3}=-5\)
c/\(45-\left(x-9\right)=-35\)
\(45-x+9=-35\)
\(x=45-\left[\left(-35\right)-9\right]=89\)
d/\(\left(-5\right)+x=15\)
\(x=15-\left(-5\right)=20\)
e/\(2x-\left(-17\right)=15\)
\(2x=15-17=-2\)
\(x=-\frac{2}{2}=-1\)
g/ \(Ix-2I=3\)
TH1: \(x-2=3\)
\(x=3+2=5\)
TH2: \(x-2=-3\)
\(x=\left(-3\right)+2=-1\)
=> \(x\in\left\{-1;5\right\}\)
-15(21-3x)=-63
21-3x=(-63)-(-15)
21-3x= -48
3x=(-48)-21
3x=-27
x=-27:3
x=-9