213=-21+6r

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Solution for 213=-21+6r equation: 



213=-21+6r

We move all terms to the left:

213-(-21+6r)=0

We add all the numbers together, and all the variables

-(6r-21)+213=0

We get rid of parentheses

-6r+21+213=0

We add all the numbers together, and all the variables

-6r+234=0

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

-6r=-234

r=-234/-6

r=+39

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