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-12/u=-3
We move all terms to the left:
-12/u-(-3)=0
Domain of the equation: u!=0We add all the numbers together, and all the variables
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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