r/9=90

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Solution for r/9=90 equation: 



r/9=90

We move all terms to the left:

r/9-(90)=0

We multiply all the terms by the denominator


r-90*9=0

We add all the numbers together, and all the variables

r-810=0

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

r=810

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