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(7/8)*(8*x-15) = 4 // - 4
(7/8)*(8*x-15)-4 = 0
7/8*(8*x-15)-4 = 0
7/8*(8*x-15)-4 = 0
7*x-137/8 = 0
7*x-137/8 = 0
7*x-137/8 = 0 // + 137/8
7*x = 137/8 // : 7
x = 137/8/7
x = 137/56
x = 137/56
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