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