20=r*0.5

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Solution for 20=r*0.5 equation: 



20=r*0.5

We move all terms to the left:

20-(r*0.5)=0

We add all the numbers together, and all the variables

-(+r*0.5)+20=0

We get rid of parentheses

-r*0.5+20=0

Wy multiply elements

-0.5r+20=0

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

-0.5r=-20

r=-20/-0.5

r=+40

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