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3c+9=12+10
We move all terms to the left:
3c+9-(12+10)=0
We add all the numbers together, and all the variables
3c+9-22=0
We add all the numbers together, and all the variables
3c-13=0
We move all terms containing c to the left, all other terms to the right
3c=13
c=13/3
c=4+1/3
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