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(1/2)*x+1 = (5/7)*x+143/140 // - (5/7)*x+143/140
(1/2)*x-((5/7)*x)-(143/140)+1 = 0
(1/2)*x+(-5/7)*x-143/140+1 = 0
-3/14*x-3/140 = 0 // + 3/140
-3/14*x = 3/140 // : -3/14
x = 3/140/(-3/14)
x = -1/10
x = -1/10
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