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-96=-5c-7c
We move all terms to the left:
-96-(-5c-7c)=0
We add all the numbers together, and all the variables
-(-12c)-96=0
We get rid of parentheses
12c-96=0
We move all terms containing c to the left, all other terms to the right
12c=96
c=96/12
c=8
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