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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
5 = -3/y-8 // + -3/y-8
5-(-3/y)+8 = 0
3*y^-1+5+8 = 0
3*y^-1 = -13 // : 3
y^-1 = -13/3
-1 < 0
1/(y^1) = -13/3 // * y^1
1 = -13/3*y^1 // : -13/3
-3/13 = y^1
y = -3/13
y = -3/13
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