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(2/3)*x-(4/3) = (-1/2)*x-3 // - (-1/2)*x-3
(2/3)*x-((-1/2)*x)-(4/3)+3 = 0
(2/3)*x+(1/2)*x-4/3+3 = 0
7/6*x+5/3 = 0 // - 5/3
7/6*x = -5/3 // : 7/6
x = -5/3/7/6
x = -10/7
x = -10/7
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