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