9r-40=15

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Solution for 9r-40=15 equation: 



9r-40=15

We move all terms to the left:

9r-40-(15)=0

We add all the numbers together, and all the variables

9r-55=0

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

9r=55

r=55/9

r=6+1/9

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