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7*x-(6/8) = 5*x-4 // - 5*x-4
7*x-(5*x)-(6/8)+4 = 0
7*x-5*x-3/4+4 = 0
2*x+13/4 = 0 // - 13/4
2*x = -13/4 // : 2
x = -13/4/2
x = -13/8
x = -13/8
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