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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
x/(x^2)-(6/(x^2))-25-10+25 = 0
x/(x^2)-6*x^-2-25-10+25 = 0
x^-1-6*x^-2-10 = 0
t_1 = x^-1
1*t_1^1-6*t_1^2-10 = 0
t_1-6*t_1^2-10 = 0
DELTA = 1^2-(-10*(-6)*4)
DELTA = -239
DELTA < 0
x belongs to the empty set
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