84=4r-9

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Solution for 84=4r-9 equation: 



84=4r-9

We move all terms to the left:

84-(4r-9)=0

We get rid of parentheses

-4r+9+84=0

We add all the numbers together, and all the variables

-4r+93=0

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

-4r=-93

r=-93/-4

r=23+1/4

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