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5c+3=7c-9
We move all terms to the left:
5c+3-(7c-9)=0
We get rid of parentheses
5c-7c+9+3=0
We add all the numbers together, and all the variables
-2c+12=0
We move all terms containing c to the left, all other terms to the right
-2c=-12
c=-12/-2
c=+6
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