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x in (-oo:+oo)
-5/2 = 3*x-(2*x)+1/2 // - 3*x-(2*x)+1/2
2*x-(3*x)-5/2-(1/2) = 0
2*x-3*x-5/2-1/2 = 0
-x-3 = 0 // + 3
-x = 3 // * -1
x = -3
x = -3
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