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2c=9c-91
We move all terms to the left:
2c-(9c-91)=0
We get rid of parentheses
2c-9c+91=0
We add all the numbers together, and all the variables
-7c+91=0
We move all terms containing c to the left, all other terms to the right
-7c=-91
c=-91/-7
c=+13
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