9r/21=3

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Solution for 9r/21=3 equation: 



9r/21=3

We move all terms to the left:

9r/21-(3)=0

We multiply all the terms by the denominator


9r-3*21=0

We add all the numbers together, and all the variables

9r-63=0

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

9r=63

r=63/9

r=7

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