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(3/7)*x-(1/12) = (-4/7)*x-(3/4) // - (-4/7)*x-(3/4)
(3/7)*x-((-4/7)*x)-(1/12)+3/4 = 0
(3/7)*x+(4/7)*x-1/12+3/4 = 0
x+2/3 = 0 // - 2/3
x = -2/3
x = -2/3
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