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20=4c/c-4
We move all terms to the left:
20-(4c/c-4)=0
Domain of the equation: c-4)!=0We get rid of parentheses
c∈R
-4c/c+4+20=0
We multiply all the terms by the denominator
-4c+4*c+20*c=0
We add all the numbers together, and all the variables
20c=0
c=0/20
c=0
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