5x³-3x+7+2x²-11+7x³-11x²+4x-3
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Step-by-step explanation:
5x³-3x+7+2x²-11+7x³-11x²+4x-3
= 5x³+7x³-3x+4x+7-3-11+2x²-11x²
= 12x³+x-7-9x²
= 12x³-9x²+x-7
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