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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x+19 = 4 // - 4
2/x-4+19 = 0
2*x^-1 = -15 // : 2
x^-1 = -15/2
-1 < 0
1/(x^1) = -15/2 // * x^1
1 = -15/2*x^1 // : -15/2
-2/15 = x^1
x = -2/15
x = -2/15
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