9-r+12=-24

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Solution for 9-r+12=-24 equation: 



9-r+12=-24

We move all terms to the left:

9-r+12-(-24)=0

We add all the numbers together, and all the variables

-1r+45=0

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

-r=-45

r=-45/-1

r=+45

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