21(1-r)=36.1r

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Solution for 21(1-r)=36.1r equation: 



21(1-r)=36.1r

We move all terms to the left:

21(1-r)-(36.1r)=0

We add all the numbers together, and all the variables

21(-1r+1)-(+36.1r)=0

We multiply parentheses

-21r-(+36.1r)+21=0

We get rid of parentheses

-21r-36.1r+21=0

We add all the numbers together, and all the variables

-57.1r+21=0

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

-57.1r=-21

r=-21/-57.1

r=7/19.033333333333

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