C=18.9-2.1r

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Solution for C=18.9-2.1r equation: 



=18.9-2.1C

We move all terms to the left:

-(18.9-2.1C)=0

We add all the numbers together, and all the variables

-(-2.1C+18.9)=0

We get rid of parentheses

2.1C-18.9=0

We move all terms containing C to the left, all other terms to the right

2.1C=18.9

C=18.9/2.1

C=8+1/1

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