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(1/2)*x-5 = (-1/4)*x-8 // - (-1/4)*x-8
(1/2)*x-((-1/4)*x)-5+8 = 0
(1/2)*x+(1/4)*x-5+8 = 0
3/4*x+3 = 0 // - 3
3/4*x = -3 // : 3/4
x = -3/3/4
x = -4
x = -4
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