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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
(5/3)*a+8 = -2/a-1 // + -2/a-1
(5/3)*a-(-2/a)+1+8 = 0
(5/3)*a+2*a^-1+1+8 = 0
5/3*a^1+2*a^-1+9*a^0 = 0
(5/3*a^2+9*a^1+2*a^0)/(a^1) = 0 // * a^2
a^1*(5/3*a^2+9*a^1+2*a^0) = 0
a^1
(5/3)*a^2+9*a+2 = 0
(5/3)*a^2+9*a+2 = 0
DELTA = 9^2-(2*4*(5/3))
DELTA = 203/3
DELTA > 0
a = ((203/3)^(1/2)-9)/(2*(5/3)) or a = (-(203/3)^(1/2)-9)/(2*(5/3))
a = 3/10*((203/3)^(1/2)-9) or a = -3/10*((203/3)^(1/2)+9)
a in { -3/10*((203/3)^(1/2)+9), 3/10*((203/3)^(1/2)-9)}
a in { -3/10*((203/3)^(1/2)+9), 3/10*((203/3)^(1/2)-9) }
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