-7r+21=-7(6+4r)

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Solution for -7r+21=-7(6+4r) equation: 



-7r+21=-7(6+4r)

We move all terms to the left:

-7r+21-(-7(6+4r))=0

We add all the numbers together, and all the variables

-7r-(-7(4r+6))+21=0



We calculate terms in parentheses: -(-7(4r+6)), so:

-7(4r+6)

We multiply parentheses

-28r-42

Back to the equation:

-(-28r-42)



We get rid of parentheses

-7r+28r+42+21=0

We add all the numbers together, and all the variables

21r+63=0

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

21r=-63

r=-63/21

r=-3

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