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