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-2[-c-12]= -2c-12
We simplify the equation to the form, which is simple to understand
-2(-c-12)=-2c-12
Reorder the terms in parentheses
+(+2c+24)=-2c-12
Remove unnecessary parentheses
+2c+24=-2c-12
We move all terms containing c to the left and all other terms to the right.
+2c+2c=-12-24
We simplify left and right side of the equation.
+4c=-36
We divide both sides of the equation by 4 to get c.
c=-9
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