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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
5 = 4/y-8 // - 4/y-8
5-(4/y)+8 = 0
5-4*y^-1+8 = 0
-4*y^-1 = -13 // : -4
y^-1 = 13/4
-1 < 0
1/(y^1) = 13/4 // * y^1
1 = 13/4*y^1 // : 13/4
4/13 = y^1
y = 4/13
y = 4/13
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