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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
3/y-2 = -(5/y)-4-3 // + -(5/y)-4-3
3/y+5/y-2+3+4 = 0
8*y^-1 = -5 // : 8
y^-1 = -5/8
-1 < 0
1/(y^1) = -5/8 // * y^1
1 = -5/8*y^1 // : -5/8
-8/5 = y^1
y = -8/5
y = -8/5
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