21/15=7r

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Solution for 21/15=7r equation: 



21/15=7r

We move all terms to the left:

21/15-(7r)=0

We multiply all the terms by the denominator


-7r*15+21=0

Wy multiply elements

-105r+21=0

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

-105r=-21

r=-21/-105

r=1/5

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