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