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20=86-c
We move all terms to the left:
20-(86-c)=0
We add all the numbers together, and all the variables
-(-1c+86)+20=0
We get rid of parentheses
1c-86+20=0
We add all the numbers together, and all the variables
c-66=0
We move all terms containing c to the left, all other terms to the right
c=66
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