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(3x² - 2xy + 5y²)(7x - 3y) =
21x³ - 14x²y + 35xy² - 9x²y + 6xy² - 15y³ =
21x³ - 23x²y + 41xy² - 15y³ =
por lo tanto la suma de coeficientes será:
S = 21-23+41-15 = 24