1+9/r=4

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Solution for 1+9/r=4 equation: 



1+9/r=4

We move all terms to the left:

1+9/r-(4)=0



Domain of the equation: r!=0

r∈R



We add all the numbers together, and all the variables

9/r-3=0

We multiply all the terms by the denominator


-3*r+9=0

We add all the numbers together, and all the variables

-3r+9=0

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

-3r=-9

r=-9/-3

r=+3

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