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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.15 = 1-(3/x) // - 1-(3/x)
3/x-1+1.15 = 0
3*x^-1 = -0.15 // : 3
x^-1 = -0.05
-1 < 0
1/(x^1) = -0.05 // * x^1
1 = -0.05*x^1 // : -0.05
-20 = x^1
x = -20
x = -20
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