21+2r=4(3r-2)-1

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Solution for 21+2r=4(3r-2)-1 equation: 



21+2r=4(3r-2)-1

We move all terms to the left:

21+2r-(4(3r-2)-1)=0



We calculate terms in parentheses: -(4(3r-2)-1), so:

4(3r-2)-1

We multiply parentheses

12r-8-1

We add all the numbers together, and all the variables

12r-9

Back to the equation:

-(12r-9)



We get rid of parentheses

2r-12r+9+21=0

We add all the numbers together, and all the variables

-10r+30=0

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

-10r=-30

r=-30/-10

r=+3

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