4r=21+2.50r

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Solution for 4r=21+2.50r equation: 



4r=21+2.50r

We move all terms to the left:

4r-(21+2.50r)=0

We add all the numbers together, and all the variables

4r-(2.50r+21)=0

We get rid of parentheses

4r-2.50r-21=0

We add all the numbers together, and all the variables

1.5r-21=0

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

1.5r=21

r=21/1.5

r=14

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