(2x+1)^3 - ( 2x - 2)^3
(3x-1)^3 + (x-4)^3
(2x + 3)^3 - (3x +2)^3
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(2x+1)^3 - ( 2x - 2)^3 = 8x^3+12x^2+6x+1-(8x^3+12x^2+24x+8)=8x^3+12x^2+6x+1-8x^3-12x^2-24x-8=-18x-7
(3x-1)^3 + (x-4)^3= 27x^3+27x^2+9x+1+x^3-12x^2+48x+64=28x^3+15x^2+65