15=r*3

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Solution for 15=r*3 equation: 



15=r*3

We move all terms to the left:

15-(r*3)=0

We add all the numbers together, and all the variables

-(+r*3)+15=0

We get rid of parentheses

-r*3+15=0

Wy multiply elements

-3r+15=0

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

-3r=-15

r=-15/-3

r=+5

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