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-1=7c-8
We move all terms to the left:
-1-(7c-8)=0
We get rid of parentheses
-7c+8-1=0
We add all the numbers together, and all the variables
-7c+7=0
We move all terms containing c to the left, all other terms to the right
-7c=-7
c=-7/-7
c=1
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