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(5/7)*x+1 = (-1/2)*x+1/35 // - (-1/2)*x+1/35
(5/7)*x-((-1/2)*x)-(1/35)+1 = 0
(5/7)*x+(1/2)*x-1/35+1 = 0
17/14*x+34/35 = 0 // - 34/35
17/14*x = -34/35 // : 17/14
x = -34/35/17/14
x = -4/5
x = -4/5
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