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(6/7)*x-(3/8) = (-1/7)*x-(1/4) // - (-1/7)*x-(1/4)
(6/7)*x-((-1/7)*x)-(3/8)+1/4 = 0
(6/7)*x+(1/7)*x-3/8+1/4 = 0
x-1/8 = 0 // + 1/8
x = 1/8
x = 1/8
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