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6*x+7/8 = (2/7)*x-271/56 // - (2/7)*x-271/56
6*x-((2/7)*x)+7/8-(-271/56) = 0
6*x+(-2/7)*x+7/8+271/56 = 0
40/7*x+40/7 = 0 // - 40/7
40/7*x = -40/7 // : 40/7
x = -40/7/40/7
x = -1
x = -1
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