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(5/8)*(3*x+7) = 10 // - 10
(5/8)*(3*x+7)-10 = 0
5/8*(3*x+7)-10 = 0
5/8*(3*x+7)-10 = 0
15/8*x-45/8 = 0
15/8*x-45/8 = 0
15/8*x-45/8 = 0 // + 45/8
15/8*x = 45/8 // : 15/8
x = 45/8/15/8
x = 3
x = 3
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