-r+18=9

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Solution for -r+18=9 equation: 



-r+18=9

We move all terms to the left:

-r+18-(9)=0

We add all the numbers together, and all the variables

-1r+9=0

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

-r=-9

r=-9/-1

r=+9

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