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9=c/3+7
We move all terms to the left:
9-(c/3+7)=0
We get rid of parentheses
-c/3-7+9=0
We multiply all the terms by the denominator
-c-7*3+9*3=0
We add all the numbers together, and all the variables
-1c+6=0
We move all terms containing c to the left, all other terms to the right
-c=-6
c=-6/-1
c=+6
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