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-89=7+4c
We move all terms to the left:
-89-(7+4c)=0
We add all the numbers together, and all the variables
-(4c+7)-89=0
We get rid of parentheses
-4c-7-89=0
We add all the numbers together, and all the variables
-4c-96=0
We move all terms containing c to the left, all other terms to the right
-4c=96
c=96/-4
c=-24
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