(3y² - 4y - 1) - (3y² + 2y - 7)
= 3y² - 4y - 1 - 3y² - 2y + 7
= 3y² - 3y² - 4y - 2y - 1 + 7
= 0 - 6y + 6
= -6y + 6 (answer)
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(3y² - 4y - 1) - (3y² + 2y - 7)
= 3y² - 4y - 1 - 3y² - 2y + 7
= 3y² - 3y² - 4y - 2y - 1 + 7
= 0 - 6y + 6
= -6y + 6 (answer)