18+-9r=-9

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Solution for 18+-9r=-9 equation: 



18+-9r=-9

We move all terms to the left:

18+-9r-(-9)=0

We add all the numbers together, and all the variables

-9r+27=0

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

-9r=-27

r=-27/-9

r=+3

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