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(y + 3)(y + 3) - (y - 3)(y - 3)
y² + 3y + 3y + 9 - (y² - 3y - 3y + 9)
y² + 6y + 9 - (y² - 6y + 9)
y² + 6y + 9 - y² + 6y - 9
y² - y² + 6y + 6y + 9 - 9
12y