From the sum of 3x^2 - 4x +2 and -7x² + 6x + 9 subtract -5x² +7x-5.
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Step-by-step explanation:
(3x*2-4x+2)+(-7x*2+6x+9)
=(-4x*2+2x+11)
(-4x*2+2x+11)-(-5x*2+7x-5)
=x*2-5x+6
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