r/9=21

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Solution for r/9=21 equation: 



r/9=21

We move all terms to the left:

r/9-(21)=0

We multiply all the terms by the denominator


r-21*9=0

We add all the numbers together, and all the variables

r-189=0

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

r=189

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