-21-2r=-5-3(r+4)

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Solution for -21-2r=-5-3(r+4) equation: 



-21-2r=-5-3(r+4)

We move all terms to the left:

-21-2r-(-5-3(r+4))=0



We calculate terms in parentheses: -(-5-3(r+4)), so:

-5-3(r+4)

determiningTheFunctionDomain
-3(r+4)-5

We multiply parentheses

-3r-12-5

We add all the numbers together, and all the variables

-3r-17

Back to the equation:

-(-3r-17)



We get rid of parentheses

-2r+3r+17-21=0

We add all the numbers together, and all the variables

r-4=0

We move all terms containing r to the left, all other terms to the right

r=4

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