(4x³+2x²-9)+(6x³+5x-4)=10x³+7x²-13
(4x³+2x²-9)-(6x³+5x-4)=4x³+2x²-9-6x³-5x+4=-2x³-3x²+5
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(4x³+2x²-9)+(6x³+5x-4)=10x³+7x²-13
(4x³+2x²-9)-(6x³+5x-4)=4x³+2x²-9-6x³-5x+4=-2x³-3x²+5