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42/6 = 8*x-7*2*x // - 8*x-7*2*x
42/6-(8*x)-(-7*2*x) = 0
14*x-8*x+42/6 = 0
6*x+7 = 0 // - 7
6*x = -7 // : 6
x = -7/6
x = -7/6
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