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(3X - 5Y)(3X - 5Y)
9X² - 15XY - 15XY + 25Y²
9X² - 30XY + 25Y²
3X + 12 = 7X - 8
12 + 8 = 7X - 3X
20 = 4X
5 = X
a = X
a - 9
X - 9
5 - 9
-4