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-((-1/2)*x+(1/7)*x) = (9/2)*x-(-2*x)-(4/14) // - (9/2)*x-(-2*x)-(4/14)
4/14-((-1/2)*x)-((1/7)*x)-((9/2)*x)-2*x = 0
(1/2)*x+(-1/7)*x+(-9/2)*x-2*x+4/14 = 0
2/7-43/7*x = 0 // - 2/7
-43/7*x = -2/7 // : -43/7
x = -2/7/(-43/7)
x = 2/43
x = 2/43
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