89=11r+12

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Solution for 89=11r+12 equation: 



89=11r+12

We move all terms to the left:

89-(11r+12)=0

We get rid of parentheses

-11r-12+89=0

We add all the numbers together, and all the variables

-11r+77=0

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

-11r=-77

r=-77/-11

r=+7

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