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2*x-((1/2)*x)-(3/7) = (4/7)*x // - (4/7)*x
2*x-((1/2)*x)-((4/7)*x)-(3/7) = 0
2*x+(-1/2)*x+(-4/7)*x-3/7 = 0
13/14*x-3/7 = 0 // + 3/7
13/14*x = 3/7 // : 13/14
x = 3/7/13/14
x = 6/13
x = 6/13
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