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(1/2)*x-((3/8)*x) = 4 // - 4
(1/2)*x-((3/8)*x)-4 = 0
(1/2)*x+(-3/8)*x-4 = 0
1/8*x-4 = 0 // + 4
1/8*x = 4 // : 1/8
x = 4/1/8
x = 32
x = 32
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