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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
16/48 = -4/y // + -4/y
16/48-(-4/y) = 0
4*y^-1+16/48 = 0
4*y^-1 = -1/3 // : 4
y^-1 = -1/12
-1 < 0
1/(y^1) = -1/12 // * y^1
1 = -1/12*y^1 // : -1/12
-12 = y^1
y = -12
y = -12
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