4r+21=7(3+8r)

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Solution for 4r+21=7(3+8r) equation: 



4r+21=7(3+8r)

We move all terms to the left:

4r+21-(7(3+8r))=0

We add all the numbers together, and all the variables

4r-(7(8r+3))+21=0



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

7(8r+3)

We multiply parentheses

56r+21

Back to the equation:

-(56r+21)



We get rid of parentheses

4r-56r-21+21=0

We add all the numbers together, and all the variables

-52r=0

r=0/-52

r=0

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