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-9c-21=35-c
We move all terms to the left:
-9c-21-(35-c)=0
We add all the numbers together, and all the variables
-9c-(-1c+35)-21=0
We get rid of parentheses
-9c+1c-35-21=0
We add all the numbers together, and all the variables
-8c-56=0
We move all terms containing c to the left, all other terms to the right
-8c=56
c=56/-8
c=-7
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