15r=81+6R

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Solution for 15r=81+6R equation: 



15r=81+6

We move all terms to the left:

15r-(81+6)=0

We add all the numbers together, and all the variables

15r-87=0

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

15r=87

r=87/15

r=5+4/5

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