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7c-83=8c-72=2c-13
We move all terms to the left:
7c-83-(8c-72)=0
We get rid of parentheses
7c-8c+72-83=0
We add all the numbers together, and all the variables
-1c-11=0
We move all terms containing c to the left, all other terms to the right
-c=11
c=11/-1
c=-11
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