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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
y+3/y = 7/6 // - 7/6
y+3/y-(7/6) = 0
y+3/y-7/6 = 0
1*y^1+3*y^-1-7/6*y^0 = 0
(1*y^2-7/6*y^1+3*y^0)/(y^1) = 0 // * y^2
y^1*(1*y^2-7/6*y^1+3*y^0) = 0
y^1
y^2+(-7/6)*y+3 = 0
y^2+(-7/6)*y+3 = 0
DELTA = (-7/6)^2-(1*3*4)
DELTA = -383/36
DELTA < 0
y in { }
y belongs to the empty set
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