simplify : (3x - 4y) (9x+ 6y) - ( 6x + 5y) (7x - 5y)
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Answer:
= 27x² + 18xy - 36xy - 24y² - 42x² +30xy - 35xy + 25y²
= - 15x² + y² - 24xy
= 15x² - y² + 24xy
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