0
Anonymous
15x3+12x2
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12x2=24
45
12x6 - 16x3 - 15x3 + 20 = 4x3(3x3 - 4) - 5(3x3 - 4) = (3x3 - 4)(4x3 - 5)
4x3+12x2+3x+9
4554