-11r-12=-9r

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Solution for -11r-12=-9r equation: 



-11r-12=-9r

We move all terms to the left:

-11r-12-(-9r)=0

We get rid of parentheses

-11r+9r-12=0

We add all the numbers together, and all the variables

-2r-12=0

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

-2r=12

r=12/-2

r=-6

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