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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



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

-(-3r+2)-3

We get rid of parentheses

3r-2-3

We add all the numbers together, and all the variables

3r-5

Back to the equation:

-(3r-5)



We get rid of parentheses

r-3r+5-21=0

We add all the numbers together, and all the variables

-2r-16=0

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

-2r=16

r=16/-2

r=-8

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