r=(30-18)/30

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Solution for r=(30-18)/30 equation: 



r=(30-18)/30

We move all terms to the left:

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

We add all the numbers together, and all the variables

r-(12/30)=0

We get rid of parentheses

r-12/30=0

We multiply all the terms by the denominator


r*30-12=0

Wy multiply elements

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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