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

Wy multiply elements

-21r+15=0

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

-21r=-15

r=-15/-21

r=5/7

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