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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x+19 = 0
7*x^-1 = -19 // : 7
x^-1 = -19/7
-1 < 0
1/(x^1) = -19/7 // * x^1
1 = -19/7*x^1 // : -19/7
-7/19 = x^1
x = -7/19
x = -7/19
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