(21x^7)/(14x^3)

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Solution for (21x^7)/(14x^3) equation: 


D( x )

14*x^3 = 0

14*x^3 = 0

14*x^3 = 0

14*x^3 = 0 // : 14

x^3 = 0

x = 0

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

(21*x^7)/(14*x^3) = 0

3/2*x^4 = 0 // : 3/2

x^4 = 0

x = 0

x in { 0} 

x belongs to the empty set

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