-21+7r=-7(8r+3)+2r

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Solution for -21+7r=-7(8r+3)+2r equation: 



-21+7r=-7(8r+3)+2r

We move all terms to the left:

-21+7r-(-7(8r+3)+2r)=0



We calculate terms in parentheses: -(-7(8r+3)+2r), so:

-7(8r+3)+2r

We add all the numbers together, and all the variables

2r-7(8r+3)

We multiply parentheses

2r-56r-21

We add all the numbers together, and all the variables

-54r-21

Back to the equation:

-(-54r-21)



We get rid of parentheses

7r+54r+21-21=0

We add all the numbers together, and all the variables

61r=0

r=0/61

r=0

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