(8x + 3y)(5y - x) - (6x + 4y)(3y + 5)= 40xy - 8xy+ 15y² - 3xy -18xy - 30x - 12y²- 20y = 11xy + 3y² - 30x - 20y
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(8x + 3y)(5y - x) - (6x + 4y)(3y + 5)= 40xy - 8xy+ 15y² - 3xy -18xy - 30x - 12y²- 20y = 11xy + 3y² - 30x - 20y