add using column mathord 2x⁴+3x³y+5xy³-9,7xy³-2x³y-4x⁴ and 6x³+21x
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add using column mathord 2x⁴+3x³y+5xy³-9,7xy³-2x³y-4x⁴ and 6x³+21x the answer is (3-2x + 4x²)
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