(12+5x)+(-2х²+4x)-(-3х²+10) = 12 +5х -2х^2 +4х +3х^2 -10 = х^2 +9х +2
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(12+5x)+(-2х²+4x)-(-3х²+10) = 12 +5х -2х^2 +4х +3х^2 -10 = х^2 +9х +2