18=400*r*9

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Solution for 18=400*r*9 equation: 



18=400r*9

We move all terms to the left:

18-(400r*9)=0

We add all the numbers together, and all the variables

-(+400r*9)+18=0

We get rid of parentheses

-400r*9+18=0

Wy multiply elements

-3600r+18=0

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

-3600r=-18

r=-18/-3600

r=1/200

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