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(3/7)*x-(1/5) = (-4/7)*x-(3/4) // - (-4/7)*x-(3/4)
(3/7)*x-((-4/7)*x)-(1/5)+3/4 = 0
(3/7)*x+(4/7)*x-1/5+3/4 = 0
x+11/20 = 0 // - 11/20
x = -11/20
x = -11/20
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