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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
4/y-(5/3) = -1/5 // + -1/5
4/y-(5/3)-(-1/5) = 0
4/y-5/3+1/5 = 0
4*y^-1 = 22/15 // : 4
y^-1 = 11/30
-1 < 0
1/(y^1) = 11/30 // * y^1
1 = 11/30*y^1 // : 11/30
30/11 = y^1
y = 30/11
y = 30/11
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