Question 395494
Hi!  This is how to solve this problem: {{{-5x-8x=-78}}}

Since -5x and -8x are like terms, subtract 8x from -5x to get -13x.
{{{-13x=-78}}}

Divide each term in the equation by -13.
{{{x=6}}}

--------------------
If you have any questions about this problem, feel free to ask :)
--------------------
- Eric L