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-5+12c=4+9c
We move all terms to the left:
-5+12c-(4+9c)=0
We add all the numbers together, and all the variables
12c-(9c+4)-5=0
We get rid of parentheses
12c-9c-4-5=0
We add all the numbers together, and all the variables
3c-9=0
We move all terms containing c to the left, all other terms to the right
3c=9
c=9/3
c=3
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