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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1/y = 0.05 // - 0.05
1/y-0.05 = 0
1*y^-1 = 0.05 // : 1
y^-1 = 0.05
-1 < 0
1/(y^1) = 0.05 // * y^1
1 = 0.05*y^1 // : 0.05
20 = y^1
y = 20
y = 20
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