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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-5/x = 20/3 // - 20/3
-5/x-(20/3) = 0
-5/x-20/3 = 0
-5*x^-1 = 20/3 // : -5
x^-1 = -4/3
-1 < 0
1/(x^1) = -4/3 // * x^1
1 = -4/3*x^1 // : -4/3
-3/4 = x^1
x = -3/4
x = -3/4
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