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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x+1/19 = 0
2*x^-1 = -1/19 // : 2
x^-1 = -1/38
-1 < 0
1/(x^1) = -1/38 // * x^1
1 = -1/38*x^1 // : -1/38
-38 = x^1
x = -38
x = -38
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