4=r-9

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Solution for 4=r-9 equation: 



4=r-9

We move all terms to the left:

4-(r-9)=0

We get rid of parentheses

-r+9+4=0

We add all the numbers together, and all the variables

-1r+13=0

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

-r=-13

r=-13/-1

r=+13

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