4f/(9f)

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Solution for 4f/(9f) equation: 


D( f )

9*f = 0

9*f = 0

9*f = 0

9*f = 0 // : 9

f = 0

f in (-oo:0) U (0:+oo)

(4*f)/(9*f) = 0

4/9 = 0

f belongs to the empty set

f belongs to the empty set

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