-3=r-9

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Solution for -3=r-9 equation: 



-3=r-9

We move all terms to the left:

-3-(r-9)=0

We get rid of parentheses

-r+9-3=0

We add all the numbers together, and all the variables

-1r+6=0

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

-r=-6

r=-6/-1

r=+6

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