9-9r=-10r

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Solution for 9-9r=-10r equation: 



9-9r=-10r

We move all terms to the left:

9-9r-(-10r)=0

We get rid of parentheses

-9r+10r+9=0

We add all the numbers together, and all the variables

r+9=0

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

r=-9

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