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