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-5/7u=20
We move all terms to the left:
-5/7u-(20)=0
Domain of the equation: 7u!=0We multiply all the terms by the denominator
u!=0/7
u!=0
u∈R
-20*7u-5=0
Wy multiply elements
-140u-5=0
We move all terms containing u to the left, all other terms to the right
-140u=5
u=5/-140
u=-1/28
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