You can
put this solution on YOUR website!
I'm not sure what your main difficulty is, but I'll
go through it in detail
First you need the distributive law which is

is the same as

Note that +(-5) = -5 (or any number, I just picked 5)
So far, I have:

I'll use the same law again on the right side

Now subtract

from both sides

Simplify the right side

Subtract

from both sides

Divide both sides by

or, write it like

Now check the answer:

Add the number inside the ( ) on right side

OK