(2x + 3)3 - (3x -2)3 - (5x + 1)3
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(8x^3+27+36x^2+54x)-(27x^3-8-54x^2+36x)-(125x^3+1+75x^2+15x)
= 8x^3-27x^3-125x^3+27+8-1+36x^2+54x^2-75x^2+54x-36x-15x
= (-134x^3)+15x^2+3x+34
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