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20+4/3u=0
Domain of the equation: 3u!=0We multiply all the terms by the denominator
u!=0/3
u!=0
u∈R
20*3u+4=0
Wy multiply elements
60u+4=0
We move all terms containing u to the left, all other terms to the right
60u=-4
u=-4/60
u=-1/15
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