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7/20u=28
We move all terms to the left:
7/20u-(28)=0
Domain of the equation: 20u!=0We multiply all the terms by the denominator
u!=0/20
u!=0
u∈R
-28*20u+7=0
Wy multiply elements
-560u+7=0
We move all terms containing u to the left, all other terms to the right
-560u=-7
u=-7/-560
u=1/80
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