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36=-3c+6c
We move all terms to the left:
36-(-3c+6c)=0
We add all the numbers together, and all the variables
-(+3c)+36=0
We get rid of parentheses
-3c+36=0
We move all terms containing c to the left, all other terms to the right
-3c=-36
c=-36/-3
c=+12
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