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