18=30-30r

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Solution for 18=30-30r equation: 



18=30-30r

We move all terms to the left:

18-(30-30r)=0

We add all the numbers together, and all the variables

-(-30r+30)+18=0

We get rid of parentheses

30r-30+18=0

We add all the numbers together, and all the variables

30r-12=0

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

30r=12

r=12/30

r=2/5

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