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D( x )
x = 0
2*x = 0
x = 0
x = 0
2*x = 0
2*x = 0
2*x = 0 // : 2
x = 0
x in (-oo:0) U (0:+oo)
a/x+b/(2*x) = 0
a*x^-1+1/2*b*x^-1 = 0
t_1 = x^-1
a*t_1^1+1/2*b*t_1^1 = 0
1/2*b*t_1 = 0 // : 1/2*b
t_1 = 0
t_1 = 0
x^-1+0 = 0
x^-1 = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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