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