find the sum of the algebraic expression 3x³-5x²+2x+1,3x-2x²-x³,2x²-7x+9
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Step-by-step explanation:
3x^3-5x^2+2x
-x^3-2x^2+3x
2x^27x9
=2x^3-5x^2-2x+9
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