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(3/8)*x-((1/2)*x) = -3/2 // + -3/2
(3/8)*x-((1/2)*x)-(-3/2) = 0
(3/8)*x+(-1/2)*x+3/2 = 0
3/2-1/8*x = 0 // - 3/2
-1/8*x = -3/2 // : -1/8
x = -3/2/(-1/8)
x = 12
x = 12
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