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10
7x/ 10 = 10+4
7x/10 = 14
7x = 14 x 10
x = 140/7
x = 20
b. x/2 - x/4 = 2
x/2 = 2 + x/ 4
x/2 = 8/4 + x/4
x/2 = 8x/4
4x = 8x x 2
4x = 16x
4x - 16x = 0
-12 x = 0
x = 12
c. 3(2x+4) -(4x-1) = -8
6x + 12 -4x +1 = -8
6x - 4x = -8 -12 -1
2x = -21
x = -21/2
d. 4x + 5 (2-x)= 3x -2
4x +10 - 5x = 3x-2
4x - 5x -3x = -2 - 10
-4x = -12
x = -12/-4
x = 3