21-2r=7(6r+3)

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Solution for 21-2r=7(6r+3) equation: 



21-2r=7(6r+3)

We move all terms to the left:

21-2r-(7(6r+3))=0



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

7(6r+3)

We multiply parentheses

42r+21

Back to the equation:

-(42r+21)



We get rid of parentheses

-2r-42r-21+21=0

We add all the numbers together, and all the variables

-44r=0

r=0/-44

r=0

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