5r=21+2r

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Solution for 5r=21+2r equation: 



5r=21+2r

We move all terms to the left:

5r-(21+2r)=0

We add all the numbers together, and all the variables

5r-(2r+21)=0

We get rid of parentheses

5r-2r-21=0

We add all the numbers together, and all the variables

3r-21=0

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

3r=21

r=21/3

r=7

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