(5x^2-15x)/(15x^4)

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Solution for (5x^2-15x)/(15x^4) equation: 


D( x )

15*x^4 = 0

15*x^4 = 0

15*x^4 = 0

15*x^4 = 0 // : 15

x^4 = 0

x = 0

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

(5*x^2-(15*x))/(15*x^4) = 0

(5*x^2-15*x)/(15*x^4) = 0

5*x^2-15*x = 0

5*x*(x-3) = 0

x-3 = 0 // + 3

x = 3

5*x*(x-3) = 0

(5*x*(x-3))/(15*x^4) = 0

( 5*x )

5*x = 0 // : 5

x = 0

( x-3 )

x-3 = 0 // + 3

x = 3

x in { 0} 

x = 3

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