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(2/3)*x-3 = (1/2)*x-7 // - (1/2)*x-7
(2/3)*x-((1/2)*x)-3+7 = 0
(2/3)*x+(-1/2)*x-3+7 = 0
1/6*x+4 = 0 // - 4
1/6*x = -4 // : 1/6
x = -4/1/6
x = -24
x = -24
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