9. Simplify:
(2x^3-5x^2+7)-(4x^2-8)+(-3x^3+6x^2)
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Step-by-step explanation:
(2x³-5x²+7)-(4x²-8)+(3x³+6x²)
2x³-5x²+7-4x²+8+3x²+6x
2x³-6x²+6x+15
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