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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
5/y-((2/3)*y) = 13/2 // - 13/2
5/y-((2/3)*y)-(13/2) = 0
(-2/3)*y+5/y-13/2 = 0
5*y^-1-2/3*y^1-13/2*y^0 = 0
(5*y^0-2/3*y^2-13/2*y^1)/(y^1) = 0 // * y^2
y^1*(5*y^0-2/3*y^2-13/2*y^1) = 0
y^1
(-2/3)*y^2+(-13/2)*y+5 = 0
(-2/3)*y^2+(-13/2)*y+5 = 0
DELTA = (-13/2)^2-(4*5*(-2/3))
DELTA = 667/12
DELTA > 0
y = ((667/12)^(1/2)-(-13/2))/(2*(-2/3)) or y = (-(-13/2)-(667/12)^(1/2))/(2*(-2/3))
y = -3/4*((667/12)^(1/2)+13/2) or y = -3/4*(13/2-(667/12)^(1/2))
y in { -3/4*((667/12)^(1/2)+13/2), -3/4*(13/2-(667/12)^(1/2))}
y in { -3/4*((667/12)^(1/2)+13/2), -3/4*(13/2-(667/12)^(1/2)) }
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