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4/9f=3
We move all terms to the left:
4/9f-(3)=0
Domain of the equation: 9f!=0We multiply all the terms by the denominator
f!=0/9
f!=0
f∈R
-3*9f+4=0
Wy multiply elements
-27f+4=0
We move all terms containing f to the left, all other terms to the right
-27f=-4
f=-4/-27
f=4/27
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