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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
-2.6/y = 1.3 // - 1.3
-2.6/y-1.3 = 0
-2.6*y^-1 = 1.3 // : -2.6
y^-1 = -0.5
-1 < 0
1/(y^1) = -0.5 // * y^1
1 = -0.5*y^1 // : -0.5
-2 = y^1
y = -2
y = -2
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