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15.3=c/21
We move all terms to the left:
15.3-(c/21)=0
We add all the numbers together, and all the variables
-(+c/21)+15.3=0
We get rid of parentheses
-c/21+15.3=0
We multiply all the terms by the denominator
-c+(15.3)*21=0
We add all the numbers together, and all the variables
-1c+321.3=0
We move all terms containing c to the left, all other terms to the right
-c=-321.3
c=-321.3/-1
c=321+0.3/1
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