15=r/21

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Solution for 15=r/21 equation: 



15=r/21

We move all terms to the left:

15-(r/21)=0

We add all the numbers together, and all the variables

-(+r/21)+15=0

We get rid of parentheses

-r/21+15=0

We multiply all the terms by the denominator


-r+15*21=0

We add all the numbers together, and all the variables

-1r+315=0

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

-r=-315

r=-315/-1

r=+315

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