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(1/2)*x-5 = (-2/3)*x-12 // - (-2/3)*x-12
(1/2)*x-((-2/3)*x)-5+12 = 0
(1/2)*x+(2/3)*x-5+12 = 0
7/6*x+7 = 0 // - 7
7/6*x = -7 // : 7/6
x = -7/7/6
x = -6
x = -6
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