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D( x )
x = 0
x^25 = 0
x = 0
x = 0
x^25 = 0
x^25 = 0
1*x^25 = 0 // : 1
x^25 = 0
x = 0
x in (-oo:0) U (0:+oo)
(7/(x^25))*x+6 = (2*x)/x-(x/x)-3-2 // - (2*x)/x-(x/x)-3-2
(7/(x^25))*x-((2*x)/x)+x/x+2+3+6 = 0
(7/(x^25))*x+x/x-2+2+3+6 = 0
7*x^-24 = -10 // : 7
x^-24 = -10/7
-24 < 0
1/(x^24) = -10/7 // * x^24
1 = -10/7*x^24 // : -10/7
-7/10 = x^24
x belongs to the empty set
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