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