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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)-8+1 = 0
(5/3)*a+2*a^-1-8+1 = 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 = (7-(107/3)^(1/2))/(2*(5/3))
a = 3/10*((107/3)^(1/2)+7) or a = 3/10*(7-(107/3)^(1/2))
a in { 3/10*(7-(107/3)^(1/2)), 3/10*((107/3)^(1/2)+7)}
a in { 3/10*(7-(107/3)^(1/2)), 3/10*((107/3)^(1/2)+7) }
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