-9+3r=-18

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Solution for -9+3r=-18 equation: 



-9+3r=-18

We move all terms to the left:

-9+3r-(-18)=0

We add all the numbers together, and all the variables

3r+9=0

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

3r=-9

r=-9/3

r=-3

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