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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
8/11 = 4/y+2 // - 4/y+2
8/11-(4/y)-2 = 0
8/11-4*y^-1-2 = 0
-4*y^-1 = 14/11 // : -4
y^-1 = -7/22
-1 < 0
1/(y^1) = -7/22 // * y^1
1 = -7/22*y^1 // : -7/22
-22/7 = y^1
y = -22/7
y = -22/7
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