-9-10r=7+5-7r

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Solution for -9-10r=7+5-7r equation: 



-9-10r=7+5-7r

We move all terms to the left:

-9-10r-(7+5-7r)=0

We add all the numbers together, and all the variables

-10r-(-7r+12)-9=0

We get rid of parentheses

-10r+7r-12-9=0

We add all the numbers together, and all the variables

-3r-21=0

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

-3r=21

r=21/-3

r=-7

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