-9-10r=-7r

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Solution for -9-10r=-7r equation: 



-9-10r=-7r

We move all terms to the left:

-9-10r-(-7r)=0

We get rid of parentheses

-10r+7r-9=0

We add all the numbers together, and all the variables

-3r-9=0

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

-3r=9

r=9/-3

r=-3

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