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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1.1/y = 2.5 // - 2.5
1.1/y-2.5 = 0
1.1*y^-1 = 2.5 // : 1.1
y^-1 = 2.27272727
-1 < 0
1/(y^1) = 2.27272727 // * y^1
1 = 2.27272727*y^1 // : 2.27272727
0.44 = y^1
y = 0.44
y = 0.44
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