-4r-21=-8(r+2)-1

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Solution for -4r-21=-8(r+2)-1 equation: 



-4r-21=-8(r+2)-1

We move all terms to the left:

-4r-21-(-8(r+2)-1)=0



We calculate terms in parentheses: -(-8(r+2)-1), so:

-8(r+2)-1

We multiply parentheses

-8r-16-1

We add all the numbers together, and all the variables

-8r-17

Back to the equation:

-(-8r-17)



We get rid of parentheses

-4r+8r+17-21=0

We add all the numbers together, and all the variables

4r-4=0

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

4r=4

r=4/4

r=1

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