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8c=-9+7c
We move all terms to the left:
8c-(-9+7c)=0
We add all the numbers together, and all the variables
8c-(7c-9)=0
We get rid of parentheses
8c-7c+9=0
We add all the numbers together, and all the variables
c+9=0
We move all terms containing c to the left, all other terms to the right
c=-9
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