12r-21=16+3r

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Solution for 12r-21=16+3r equation: 



12r-21=16+3r

We move all terms to the left:

12r-21-(16+3r)=0

We add all the numbers together, and all the variables

12r-(3r+16)-21=0

We get rid of parentheses

12r-3r-16-21=0

We add all the numbers together, and all the variables

9r-37=0

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

9r=37

r=37/9

r=4+1/9

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