All you have to do is solve for c look at the following steps :)
Step 1. Divide both sides by [tex]-2[/tex]
[tex]c= \frac{-18}{-2} [/tex]
Step 2. Simplify [tex] \frac{18}{-2} [/tex] to [tex]- \frac{18}{2} [/tex]
[tex]c= \frac{18}{2} [/tex]
Step 3. Simplify [tex] \frac{18}{2} [/tex] to [tex]9[/tex]
[tex]c=9[/tex]
Done! :) Your answer is C. c=9
