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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
4/y+6/y-(2/y) = 3 // - 3
4/y+6/y-(2/y)-3 = 0
4/y+6/y-2*y^-1-3 = 0
8*y^-1 = 3 // : 8
y^-1 = 3/8
-1 < 0
1/(y^1) = 3/8 // * y^1
1 = 3/8*y^1 // : 3/8
8/3 = y^1
y = 8/3
y = 8/3
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