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7*x-(8/7) = 6*x+12/7 // - 6*x+12/7
7*x-(6*x)-(8/7)-(12/7) = 0
7*x-6*x-8/7-12/7 = 0
x-20/7 = 0 // + 20/7
x = 20/7
x = 20/7
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