89=r+13

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Solution for 89=r+13 equation: 



89=r+13

We move all terms to the left:

89-(r+13)=0

We get rid of parentheses

-r-13+89=0

We add all the numbers together, and all the variables

-1r+76=0

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

-r=-76

r=-76/-1

r=+76

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