9=5-4r

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Solution for 9=5-4r equation: 



9=5-4r

We move all terms to the left:

9-(5-4r)=0

We add all the numbers together, and all the variables

-(-4r+5)+9=0

We get rid of parentheses

4r-5+9=0

We add all the numbers together, and all the variables

4r+4=0

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

4r=-4

r=-4/4

r=-1

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