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9c= -135
(divide each side by 9 to isolate c)
c= -15
The "answer" is the number that 'c' must be in order to make that statement true.
Here is a method of finding out what that number is:
First, write the equation:
9c = -135
Next, divide each side of the equation by 9 :
c = -15
Next ... well gosh! There's nothing to do next.
There's the 'answer'. 'c' must be -15.