Ln(7x)/x^4

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Solution for Ln(7x)/x^4 equation: 


D( x )

x^4 = 0

7*x <= 0

x^4 = 0

x^4 = 0

1*x^4 = 0 // : 1

x^4 = 0

x = 0

7*x <= 0

7*x <= 0

7*x+0 <= 0 // - 0

7*x <= 0 // : 7

x <= 0/7

x <= 0

x in (0:+oo)

ln(7*x)/(x^4) = 0

ln(7*x)/(x^4) = 0 // * x^4

ln(7*x) = 0

ln(7*x) = ln(e^0)

7*x = e^0

7*x-e^0 = 0

7*x-1 = 0 // + 1

7*x = 1 // : 7

x = 1/7

x = 1/7

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