10=400/r

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Solution for 10=400/r equation: 



10=400/r

We move all terms to the left:

10-(400/r)=0



Domain of the equation: r)!=0

r!=0/1

r!=0

r∈R



We add all the numbers together, and all the variables

-(+400/r)+10=0

We get rid of parentheses

-400/r+10=0

We multiply all the terms by the denominator


10*r-400=0

We add all the numbers together, and all the variables

10r-400=0

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

10r=400

r=400/10

r=40

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