21=41-3r

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Solution for 21=41-3r equation: 



21=41-3r

We move all terms to the left:

21-(41-3r)=0

We add all the numbers together, and all the variables

-(-3r+41)+21=0

We get rid of parentheses

3r-41+21=0

We add all the numbers together, and all the variables

3r-20=0

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

3r=20

r=20/3

r=6+2/3

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