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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
y+4/y+1+5 = y-(3/y)+3 // - y-(3/y)+3
y-y+4/y+3/y-3+1+5 = 0
7*y^-1 = -3 // : 7
y^-1 = -3/7
-1 < 0
1/(y^1) = -3/7 // * y^1
1 = -3/7*y^1 // : -3/7
-7/3 = y^1
y = -7/3
y = -7/3
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