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a/ => 2 - x = 22 => x = -20
b/ => x - 12 = -24 => x = -12
c/ => 11 - 26 = x - 16
=> -15 = x - 16
=> x = 1
d/ => 5x - x - 2 + 6x - 10 = 0
=> 10x - 12 = 0
=> 10x = 12
=> x = 1,2
a) x-45= -15+50
x-45= 35
x=35+45
x=80
b) 2x = -35+17
2x = -18
x = -9
c) -3 (x-4)=9-12
-3(x-4)= -3
x-4= 1
x=5
d) -36 - 4x +15 = 11
-36 - 4x = 11- 15
-36- 4x = -4
4x = -36 - (-4)
4x = -36+4 = -32
x = -32 : 4
x = -8
e) 125 - ( 3x - 20 ) = 115
3x - 20 = 125 - 115
3x -20 = 10
3x = 10+20= 30
x = 30: 3
x = 10
tick nhe ban oi
a/ (x-45) - 50 = -15
x - 45 = -15 + 50
x - 45 = 35
x = 35 + 45
x = 80
b/ 2x -17 = -35
2x = -35 + 17
2x = -18
x = -18 : 2
x = -9
a) 7x - 5 = 16 b) 156 - 2x = 82 c) 10x + 65 = 125
=> 7x = 16 + 5 => 2x = 156 - 82 => 10x = 125 - 65
=> 7x = 21 => 2x = 74 => 10x = 60
=> x = 21 : 7 => x = 74 : 2 => x = 60 : 10
=> x = 3 => x = 37 => x = 6
Vậy x = 3 Vậy x = 37 Vậy x = 6
d) 8x + 2x = 25.2 e) 15 + 5x = 40 f) 5x + 2x = 6 - 5
=> 10x = 50 => 5x = 40 - 15 => 7x = 1
=> x = 50 : 10 => 5x = 25 => x = 1 : 7
=> x = 5 => x = 25 : 5 => x = 1/7
Vậy x = 5 => x = 5 Vậy x = 1/7
Vậy x = 5
g) 5x + x = 150 : 2 + 3 h) 6x + 3x = 5 : 5 + 3 i) 5x + 3x = 3 : 3 . 4 + 12
=> 6x = 75 + 3 => 9x = 1 + 3 => 8x = 1 . 4 + 12
=> 6x = 78 => 9x = 4 => 8x = 4 + 12
=> x = 78 : 6 => x = 4 : 9 => 8x = 16
=> x = 13 => x = 4/9 => x = 16 : 8
Vậy x = 13 Vậy x = 4/9 => x = 2
Vậy x = 2
j) 4x + 2x = 68 - 2 : 2 k) 5x + x = 39 - 3 : 3 l) 7x - x = 5 : 5 + 3 . 2 - 7
=> 6x = 68 - 1 => 6x = 39 - 1 => 6x = 1 + 6 - 7
=> 6x = 67 => 6x = 38 => 6x = 7 - 7
=> x = 67 : 6 => x = 38 : 6 => 6x = 0
=> x = 67/6 => x = 19/3 => x = 0
Vậy x = 67/6 Vậy x = 19/3 Vậy x = 0
m) 7x - 2x = 6 : 6 + 44 : 11
=> 5x = 1 + 4
=> 5x = 5
=> x = 5 : 5
=> x = 1
Vậy x = 1
Mỏi tay ~~~~~~~~~~~~~~
\(a,2-x=17-\left(-5\right)\)
\(\Rightarrow2-x=17+5\)
\(\Rightarrow2-x=22\)
\(\Rightarrow x=2-22\)
\(\Rightarrow x=-20\)
Vay...
\(b,11-\left(15+11\right)=x-\left(25-9\right)\)
\(\Rightarrow11-26=x-16\)
\(\Rightarrow-15=x-16\)
\(\Rightarrow-15+16=x\)
\(\Rightarrow x=1\)
\(a,-2x+\left(5x-9\right)=0\)
\(-2x+5x-9=0\)
\(3x-9=0\)
\(3x=9\)
\(x=3\)
\(b,11+3.\left(15-x\right)=-16\)
\(3.\left(15-x\right)=-16-11\)
\(3.\left(15-x\right)=-27\)
\(15-x=-27:3\)
\(15-x=-9\)
\(x=15+9\)
\(x=24\)
\(-2x+\left(5x-9\right)=0\)
\(\Leftrightarrow-2x+5x-9=0\)
\(\Leftrightarrow-2x+5x=9\)
\(\Leftrightarrow3x=9\)
\(\Leftrightarrow x=3\)
b, \(11+3\cdot\left(15-x\right)=-16\)
\(\Leftrightarrow11+45-3x=-16\)
\(\Leftrightarrow-3x=-72\)
\(\Leftrightarrow x=24\)