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7+c/5=9
We move all terms to the left:
7+c/5-(9)=0
We add all the numbers together, and all the variables
c/5-2=0
We multiply all the terms by the denominator
c-2*5=0
We add all the numbers together, and all the variables
c-10=0
We move all terms containing c to the left, all other terms to the right
c=10
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