21=-3(7r+6)

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



21=-3(7r+6)

We move all terms to the left:

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



We calculate terms in parentheses: -(-3(7r+6)), so:

-3(7r+6)

We multiply parentheses

-21r-18

Back to the equation:

-(-21r-18)



We get rid of parentheses

21r+18+21=0

We add all the numbers together, and all the variables

21r+39=0

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

21r=-39

r=-39/21

r=-1+6/7

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