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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
3 = -4/y-6 // + -4/y-6
3-(-4/y)+6 = 0
4*y^-1+3+6 = 0
4*y^-1 = -9 // : 4
y^-1 = -9/4
-1 < 0
1/(y^1) = -9/4 // * y^1
1 = -9/4*y^1 // : -9/4
-4/9 = y^1
y = -4/9
y = -4/9
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