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10-((1/7)*x) = (2/7)*x+139/14 // - (2/7)*x+139/14
10-((1/7)*x)-((2/7)*x)-(139/14) = 0
(-1/7)*x+(-2/7)*x-139/14+10 = 0
1/14-3/7*x = 0 // - 1/14
-3/7*x = -1/14 // : -3/7
x = -1/14/(-3/7)
x = 1/6
x = 1/6
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