21=r*15

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Solution for 21=r*15 equation: 



21=r*15

We move all terms to the left:

21-(r*15)=0

We add all the numbers together, and all the variables

-(+r*15)+21=0

We get rid of parentheses

-r*15+21=0

Wy multiply elements

-15r+21=0

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

-15r=-21

r=-21/-15

r=1+2/5

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