9r-r+4=84

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Solution for 9r-r+4=84 equation: 



9r-r+4=84

We move all terms to the left:

9r-r+4-(84)=0

We add all the numbers together, and all the variables

8r-80=0

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

8r=80

r=80/8

r=10

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