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9=-3/4u
We move all terms to the left:
9-(-3/4u)=0
Domain of the equation: 4u)!=0We get rid of parentheses
u!=0/1
u!=0
u∈R
3/4u+9=0
We multiply all the terms by the denominator
9*4u+3=0
Wy multiply elements
36u+3=0
We move all terms containing u to the left, all other terms to the right
36u=-3
u=-3/36
u=-1/12
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