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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1/y = 0.02 // - 0.02
1/y-0.02 = 0
1*y^-1 = 0.02 // : 1
y^-1 = 0.02
-1 < 0
1/(y^1) = 0.02 // * y^1
1 = 0.02*y^1 // : 0.02
50 = y^1
y = 50
y = 50
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