12. Subtract 4x ^ 2 y (5x ^ 2 - 9y - 7) from 5x y ^ 2 (8y ^ 6 - 7x + 3)
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Step-by-step explanation:
5xy²(8y⁶ -7x +3 ) - 4x²y(5x² - 9y - 7)
40xy⁸ - 35x²y² +15xy² - 20x⁴y + 36x²y² + 20x²y
40xy⁸ + x²y² + 15xy² - 20x⁴y + 20 x²y
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