-9=19+r

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Solution for -9=19+r equation: 



-9=19+r

We move all terms to the left:

-9-(19+r)=0

We add all the numbers together, and all the variables

-(r+19)-9=0

We get rid of parentheses

-r-19-9=0

We add all the numbers together, and all the variables

-1r-28=0

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

-r=28

r=28/-1

r=-28

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