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6=-4/u
We move all terms to the left:
6-(-4/u)=0
Domain of the equation: u)!=0We get rid of parentheses
u!=0/1
u!=0
u∈R
4/u+6=0
We multiply all the terms by the denominator
6*u+4=0
We add all the numbers together, and all the variables
6u+4=0
We move all terms containing u to the left, all other terms to the right
6u=-4
u=-4/6
u=-2/3
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