12.4/r=3.1

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Solution for 12.4/r=3.1 equation: 



12.4/r=3.1

We move all terms to the left:

12.4/r-(3.1)=0



Domain of the equation: r!=0

r∈R



We add all the numbers together, and all the variables

12.4/r-3.1=0

We multiply all the terms by the denominator


-(3.1)*r+12.4=0

We multiply parentheses

-3.1r+12.4=0

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

-3.1r=-12.4

r=-12.4/-3.1

r=+4

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