18-2r=30

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Solution for 18-2r=30 equation: 



18-2r=30

We move all terms to the left:

18-2r-(30)=0

We add all the numbers together, and all the variables

-2r-12=0

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

-2r=12

r=12/-2

r=-6

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