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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1/y-18 = 2 // - 2
1/y-18-2 = 0
1*y^-1 = 20 // : 1
y^-1 = 20
-1 < 0
1/(y^1) = 20 // * y^1
1 = 20*y^1 // : 20
1/20 = y^1
y = 1/20
y = 1/20
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