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21=c/5
We move all terms to the left:
21-(c/5)=0
We add all the numbers together, and all the variables
-(+c/5)+21=0
We get rid of parentheses
-c/5+21=0
We multiply all the terms by the denominator
-c+21*5=0
We add all the numbers together, and all the variables
-1c+105=0
We move all terms containing c to the left, all other terms to the right
-c=-105
c=-105/-1
c=+105
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