90=20r*

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Solution for 90=20r* equation: 



90=20r*

We move all terms to the left:

90-(20r*)=0

We add all the numbers together, and all the variables

-(+20r*)+90=0

We get rid of parentheses

-20r*+90=0

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

-20r*=-90

r=-90/1

r=-90

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