30+.80r=2.30r

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Solution for 30+.80r=2.30r equation: 



30+.80r=2.30r

We move all terms to the left:

30+.80r-(2.30r)=0

We add all the numbers together, and all the variables

.80r-(+2.30r)+30=0

We get rid of parentheses

.80r-2.30r+30=0

We add all the numbers together, and all the variables

-1.5r+30=0

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

-1.5r=-30

r=-30/-1.5

r=+20

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