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c/5+81=900
We move all terms to the left:
c/5+81-(900)=0
We add all the numbers together, and all the variables
c/5-819=0
We multiply all the terms by the denominator
c-819*5=0
We add all the numbers together, and all the variables
c-4095=0
We move all terms containing c to the left, all other terms to the right
c=4095
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