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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
(5/3)*a+8 = 1-2/a // - 1-2/a
(5/3)*a-(-2/a)-1+8 = 0
(5/3)*a+2*a^-1-1+8 = 0
5/3*a^1+2*a^-1+7*a^0 = 0
(5/3*a^2+7*a^1+2*a^0)/(a^1) = 0 // * a^2
a^1*(5/3*a^2+7*a^1+2*a^0) = 0
a^1
(5/3)*a^2+7*a+2 = 0
(5/3)*a^2+7*a+2 = 0
DELTA = 7^2-(2*4*(5/3))
DELTA = 107/3
DELTA > 0
a = ((107/3)^(1/2)-7)/(2*(5/3)) or a = (-(107/3)^(1/2)-7)/(2*(5/3))
a = 3/10*((107/3)^(1/2)-7) or a = -3/10*((107/3)^(1/2)+7)
a in { -3/10*((107/3)^(1/2)+7), 3/10*((107/3)^(1/2)-7)}
a in { -3/10*((107/3)^(1/2)+7), 3/10*((107/3)^(1/2)-7) }
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