4r+21=r+2.50

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Solution for 4r+21=r+2.50 equation: 



4r+21=r+2.50

We move all terms to the left:

4r+21-(r+2.50)=0

We add all the numbers together, and all the variables

4r-(r+2.5)+21=0

We get rid of parentheses

4r-r-2.5+21=0

We add all the numbers together, and all the variables

3r+18.5=0

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

3r=-18.5

r=-18.5/3

r=-6+0.5/3

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