4/9f=81

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Solution for 4/9f=81 equation: 



4/9f=81

We move all terms to the left:

4/9f-(81)=0



Domain of the equation: 9f!=0

f!=0/9

f!=0

f∈R



We multiply all the terms by the denominator


-81*9f+4=0

Wy multiply elements

-729f+4=0

We move all terms containing f to the left, all other terms to the right

-729f=-4

f=-4/-729

f=4/729

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