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-9+c=-11-c
We simplify the equation to the form, which is simple to understand
-9+c=-11-c
We move all terms containing c to the left and all other terms to the right.
+1c+1c=-11+9
We simplify left and right side of the equation.
+2c=-2
We divide both sides of the equation by 2 to get c.
c=-1
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