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(2/3)*x-(5/6) = (-1/2)*x+4 // - (-1/2)*x+4
(2/3)*x-((-1/2)*x)-(5/6)-4 = 0
(2/3)*x+(1/2)*x-5/6-4 = 0
7/6*x-29/6 = 0 // + 29/6
7/6*x = 29/6 // : 7/6
x = 29/6/7/6
x = 29/7
x = 29/7
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