5x2-7x3+4x2-7x2+3x2-4x3
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1. 5x²-7x³+4x²-7x²+3x²-4x³
=5x²+4x²+3x²-7x²-7x³-4x³
=9x²+3x²-7x²-11x³
=12x²-7x²-11x³
=5x²-11x³.
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