(9+3)/(5-r)=-4

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Solution for (9+3)/(5-r)=-4 equation: 



(9+3)/(5-r)=-4

We move all terms to the left:

(9+3)/(5-r)-(-4)=0



Domain of the equation: (5-r)!=0

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

-r!=-5

r!=-5/-1

r!=+5

r∈R



We add all the numbers together, and all the variables

12/(-1r+5)-(-4)=0

We add all the numbers together, and all the variables

12/(-1r+5)+4=0

We multiply all the terms by the denominator


4*(-1r+5)+12=0

We multiply parentheses

-4r+20+12=0

We add all the numbers together, and all the variables

-4r+32=0

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

-4r=-32

r=-32/-4

r=+8

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