Posted by R on Tuesday, September 2, 2014 at 3:32pm.
I assume you want the value for C. When you have an equation, as long as you do the same thing to each side, it remains true. So,
C+4 = -24
You want C by itself, so if you subtract 4 from both sides, you have
C+4-4 = -24-4
4-4=0, and of course, C+0 is just C, yo now you have
C = -24-4
or,
C = -28