21+6r=3r+3(7r-5)

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Solution for 21+6r=3r+3(7r-5) equation: 



21+6r=3r+3(7r-5)

We move all terms to the left:

21+6r-(3r+3(7r-5))=0



We calculate terms in parentheses: -(3r+3(7r-5)), so:

3r+3(7r-5)

We multiply parentheses

3r+21r-15

We add all the numbers together, and all the variables

24r-15

Back to the equation:

-(24r-15)



We get rid of parentheses

6r-24r+15+21=0

We add all the numbers together, and all the variables

-18r+36=0

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

-18r=-36

r=-36/-18

r=+2

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