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Anonymous
15x - 3xy = 3x(5 - y)
20 - 4y = 4(5 - y)
15x - 3xy + 20 - 4y = (3x + 4)(5 - y)
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9xy2 - 24xy + 15x
If that's 15x2, the answer is (3x + 4)(5x - 4)
5x^3(3x + 2)
15(x-3) :)
5x(2x - 3)