-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 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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