Question 323757
{{{(3a^3+3b^3)-(7a^3+5a^2b-5ab^2+3b^3)}}} Start with the given expression.



{{{3a^3+3b^3-7a^3-5a^2b+5ab^2-3b^3}}} Distribute.



{{{(3a^3-7a^3)+(3b^3-3b^3)-5a^2b+5ab^2}}} Group like terms.



{{{-4a^3-5a^2b+5ab^2}}} Combine like terms.



So {{{(3a^3+3b^3)-(7a^3+5a^2b-5ab^2+3b^3)=-4a^3-5a^2b+5ab^2}}}