Find the sum of 4x³ + 2x² - x + 1+ 2x³-5x²- 3x + 6+x² + 8 + 5x³-7x
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= 4x³ + 2x² - x + 1+ 2x³-5x²- 3x + 6+x² + 8 + 5x³-7x
= 11x³ - 2x² - 11x + 15 ( by adding/subtracting polynomials of same degree)
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