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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
4/y = 10 // - 10
4/y-10 = 0
4*y^-1 = 10 // : 4
y^-1 = 5/2
-1 < 0
1/(y^1) = 5/2 // * y^1
1 = 5/2*y^1 // : 5/2
2/5 = y^1
y = 2/5
y = 2/5
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