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277/56 = (-5/7)*x+(1/2)*x+5 // - (-5/7)*x+(1/2)*x+5
277/56-((-5/7)*x)-((1/2)*x)-5 = 0
(5/7)*x+(-1/2)*x+277/56-5 = 0
3/14*x-3/56 = 0 // + 3/56
3/14*x = 3/56 // : 3/14
x = 3/56/3/14
x = 1/4
x = 1/4
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