4=5+r/9

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Solution for 4=5+r/9 equation: 



4=5+r/9

We move all terms to the left:

4-(5+r/9)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

-r/9-5+4=0

We multiply all the terms by the denominator


-r-5*9+4*9=0

We add all the numbers together, and all the variables

-1r-9=0

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

-r=9

r=9/-1

r=-9

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