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D( x )
5*x^4 = 0
5*x^4 = 0
5*x^4 = 0
5*x^4 = 0 // : 5
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
x = 120-((15*x^4)/(5*x^4)) // - 120-((15*x^4)/(5*x^4))
x+(15*x^4)/(5*x^4)-120 = 0
x-117 = 0 // + 117
x = 117
x = 117
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