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

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



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

We move all terms to the left:

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



We calculate terms in parentheses: -(7(4r+3)), so:

7(4r+3)

We multiply parentheses

28r+21

Back to the equation:

-(28r+21)



We get rid of parentheses

7r-28r-21+21=0

We add all the numbers together, and all the variables

-21r=0

r=0/-21

r=0

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