7 - (c + 18) > 0
-1 (c + 11)
Now "multiply" (×) each of your sides by -1
c + 11 < 0
Then, you "subtract"(-) 11 from both of your sides
c > -11
"c" becomes a negative
-c - 11.0 > 0
so, therefore your answer must be : c > -11
.. I couldn't graph it because I'm on my computer.. so i explained it for you
☺
