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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
8/y-5+9 = 0
8*y^-1 = -4 // : 8
y^-1 = -1/2
-1 < 0
1/(y^1) = -1/2 // * y^1
1 = -1/2*y^1 // : -1/2
-2 = y^1
y = -2
y = -2
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