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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
4/y-2 = -(2/y)-9-1 // + -(2/y)-9-1
4/y+2/y-2+1+9 = 0
6*y^-1 = -8 // : 6
y^-1 = -4/3
-1 < 0
1/(y^1) = -4/3 // * y^1
1 = -4/3*y^1 // : -4/3
-3/4 = y^1
y = -3/4
y = -3/4
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