9r-21=-18

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Solution for 9r-21=-18 equation: 



9r-21=-18

We move all terms to the left:

9r-21-(-18)=0

We add all the numbers together, and all the variables

9r-3=0

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

9r=3

r=3/9

r=1/3

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