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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
d = t/x-w // - t/x-w
d-(t/x)+w = 0
-t*x^-1 = -(d+w) // : -t
x^-1 = (d+w)/t
-1 < 0
1/(x^1) = (d+w)/t // * x^1
1 = x^1*((d+w)/t) // : (d+w)/t
1/((d+w)/t) = x^1
x = 1/((d+w)/t)
x = 1/((d+w)/t)
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