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(2/3)*x+13 = (-1/2)*x+8 // - (-1/2)*x+8
(2/3)*x-((-1/2)*x)-8+13 = 0
(2/3)*x+(1/2)*x-8+13 = 0
7/6*x+5 = 0 // - 5
7/6*x = -5 // : 7/6
x = -5/7/6
x = -30/7
x = -30/7
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