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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



We calculate terms in parentheses: -(-3(2r+6)), so:

-3(2r+6)

We multiply parentheses

-6r-18

Back to the equation:

-(-6r-18)



We get rid of parentheses

-6r+6r+18-21=0

We add all the numbers together, and all the variables

-3!=0

There is no solution for this equation

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