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x in (-oo:+oo)
2*x-(3*x)-(1/2)+2 = 18 // - 18
2*x-(3*x)-(1/2)-18+2 = 0
2*x-3*x-1/2-18+2 = 0
-x-33/2 = 0 // + 33/2
-x = 33/2 // * -1
x = -33/2
x = -33/2
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