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Anonymous
12x2 - 28x - 15= 12x2 - 18x - 10x - 15= 6x(2x - 3) - 5(2x - 3)= (6x - 5)(2x - 3)
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3x+12x = 15 15x = 15 x = 1
15
The answer is 180.
(4x + 5)(x - 3)
(x - 5)(x + 3)