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7*x-(15/4) = x // - x
7*x-x-(15/4) = 0
7*x-x-15/4 = 0
6*x-15/4 = 0 // + 15/4
6*x = 15/4 // : 6
x = 15/4/6
x = 5/8
x = 5/8
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