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3c-9=-9c+3
We move all terms to the left:
3c-9-(-9c+3)=0
We get rid of parentheses
3c+9c-3-9=0
We add all the numbers together, and all the variables
12c-12=0
We move all terms containing c to the left, all other terms to the right
12c=12
c=12/12
c=1
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