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(1/4)*x-((5/8)*x) = 15-36 // - 15-36
(1/4)*x-((5/8)*x)-15+36 = 0
(1/4)*x+(-5/8)*x-15+36 = 0
21-3/8*x = 0 // - 21
-3/8*x = -21 // : -3/8
x = -21/(-3/8)
x = 56
x = 56
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