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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
3/y+2/5 = 19/20 // - 19/20
3/y+2/5-(19/20) = 0
3/y+2/5-19/20 = 0
3*y^-1 = 11/20 // : 3
y^-1 = 11/60
-1 < 0
1/(y^1) = 11/60 // * y^1
1 = 11/60*y^1 // : 11/60
60/11 = y^1
y = 60/11
y = 60/11
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