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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-3/x = 2/5 // - 2/5
-3/x-(2/5) = 0
-3/x-2/5 = 0
-3*x^-1 = 2/5 // : -3
x^-1 = -2/15
-1 < 0
1/(x^1) = -2/15 // * x^1
1 = -2/15*x^1 // : -2/15
-15/2 = x^1
x = -15/2
x = -15/2
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