subtract 3x^3-4x^2+2x form x^4+2x^3+7x-6
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x⁴ + 2x³+7x-6 - (3x³ -4x² +2x)
x⁴ + 2x³ - 3x³ +4x² +7x- 2x
x⁴ - x³ + 4x² + 5x
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