Lets see what we're working with here
-18(s) + 24 - [-9] (s) = ?
Take out your "like terms"
-9(s) + 36
First, we have to 'solve' the number -9 which is equal to 0
Solve this one too (only if you want to it to make it easier) (s) - 4 = 0
We have to add a positive four to your sides (+4)
We have found one solution in this equation
The value of "S" is 4
