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52=9c+4c
We move all terms to the left:
52-(9c+4c)=0
We add all the numbers together, and all the variables
-(+13c)+52=0
We get rid of parentheses
-13c+52=0
We move all terms containing c to the left, all other terms to the right
-13c=-52
c=-52/-13
c=+4
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