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4/9f=12
We move all terms to the left:
4/9f-(12)=0
Domain of the equation: 9f!=0We multiply all the terms by the denominator
f!=0/9
f!=0
f∈R
-12*9f+4=0
Wy multiply elements
-108f+4=0
We move all terms containing f to the left, all other terms to the right
-108f=-4
f=-4/-108
f=1/27
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