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7c+91=-6c
We move all terms to the left:
7c+91-(-6c)=0
We get rid of parentheses
7c+6c+91=0
We add all the numbers together, and all the variables
13c+91=0
We move all terms containing c to the left, all other terms to the right
13c=-91
c=-91/13
c=-7
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