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-4=12/r
We move all terms to the left:
-4-(12/r)=0
Domain of the equation: r)!=0We add all the numbers together, and all the variables
r!=0/1
r!=0
r∈R
-(+12/r)-4=0
We get rid of parentheses
-12/r-4=0
We multiply all the terms by the denominator
-4*r-12=0
We add all the numbers together, and all the variables
-4r-12=0
We move all terms containing r to the left, all other terms to the right
-4r=12
r=12/-4
r=-3
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