simplify (6m-n)(36m^2+6mn+n^2)+ (3m+n)^3
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(6m-n)[(6m)^2+6m*n+n^2]+(3m+n)^3
=(6m)^3-n^3+(3m)^3+3*(3m)^2*n+3*3m*n^2+n^3
=216m^3-n^3+27m^3+27m^2n+9mn^2+n^3
=243m^3+27m^2n+9mn^2
=(6m)^3-n^3+(3m)^3+3*(3m)^2*n+3*3m*n^2+n^3
=216m^3-n^3+27m^3+27m^2n+9mn^2+n^3
=243m^3+27m^2n+9mn^2
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