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-4c-11=c+21
We move all terms to the left:
-4c-11-(c+21)=0
We get rid of parentheses
-4c-c-21-11=0
We add all the numbers together, and all the variables
-5c-32=0
We move all terms containing c to the left, all other terms to the right
-5c=32
c=32/-5
c=-6+2/5
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