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4x - 2x = 25 - 9
2x = 16
x = 8
b) 3x - 10 = 5x - 20
3x - 5x = -20 + 10
-2x = -10
x = 5
c) 3x - 10 = 5x - 20
3x -5x = -20+ 10
-2x =-10
x = 5
d) 1/2x + 6 = 1/3x + 12
1/2x - 1/3x = 12-6
3/6x - 2/6x = 6
1/6 x = 6
x = 6 / 1/6
x = 36
4x-2x=25-9
2x =16
x = 8
b. 15-4x = 6x+45
4x-6x=45-15
-2x = 30
x = - 15
c. 3x-10 = 5x-20
3x-5x = -20+10
-2x = -10
x = 5
d. 1/2x + 6 = 1/3x + 12
1/2x- 1/3x = 12-6
1/6x = 6
x = 6/ 1/6
x = 36