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x in (-oo:+oo)
2*x+1 = 3*x+12 // - 3*x+12
2*x-(3*x)-12+1 = 0
2*x-3*x-12+1 = 0
-x-11 = 0 // + 11
-x = 11 // * -1
x = -11
x = -11
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