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(1/7)*x+1/8 = (-6/7)*x+3/4 // - (-6/7)*x+3/4
(1/7)*x-((-6/7)*x)+1/8-(3/4) = 0
(1/7)*x+(6/7)*x+1/8-3/4 = 0
x-5/8 = 0 // + 5/8
x = 5/8
x = 5/8
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