89=4-5r

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Solution for 89=4-5r equation: 



89=4-5r

We move all terms to the left:

89-(4-5r)=0

We add all the numbers together, and all the variables

-(-5r+4)+89=0

We get rid of parentheses

5r-4+89=0

We add all the numbers together, and all the variables

5r+85=0

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

5r=-85

r=-85/5

r=-17

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