2r-1=-(3r+21)

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Solution for 2r-1=-(3r+21) equation: 



2r-1=-(3r+21)

We move all terms to the left:

2r-1-(-(3r+21))=0



We calculate terms in parentheses: -(-(3r+21)), so:

-(3r+21)

We get rid of parentheses

-3r-21

Back to the equation:

-(-3r-21)



We get rid of parentheses

2r+3r+21-1=0

We add all the numbers together, and all the variables

5r+20=0

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

5r=-20

r=-20/5

r=-4

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