Question 224849
All we can do is add our like terms, so {{{x^3}}} and {{{x^3}}} terms can add together, likewise with {{{x^2}}} and keep working down the exponents.

So:
{{{-7x^3+19x^3=12x^3}}}
{{{6x^2-11x^2=-5x^2}}}
{{{-11x+7x=-4x}}}
{{{13-17=-4}}}

These answers combine to give us our answer of:
{{{12x^3-5x^2-4x-4}}}