12/r=-3

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Solution for 12/r=-3 equation: 



12/r=-3

We move all terms to the left:

12/r-(-3)=0



Domain of the equation: r!=0

r∈R



We add all the numbers together, and all the variables

12/r+3=0

We multiply all the terms by the denominator


3*r+12=0

We add all the numbers together, and all the variables

3r+12=0

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

3r=-12

r=-12/3

r=-4

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