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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
-(4/y)-6/5-25-5 = -1 // + 1
1-(4/y)-6/5-25-5 = 0
1-4*y^-1-6/5-25-5 = 0
-4*y^-1 = 151/5 // : -4
y^-1 = -151/20
-1 < 0
1/(y^1) = -151/20 // * y^1
1 = -151/20*y^1 // : -151/20
-20/151 = y^1
y = -20/151
y = -20/151
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