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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
a/3-(1/a) = 8*a+7/24 // - 8*a+7/24
a/3-(8*a)-(1/a)-(7/24) = 0
a/3-8*a-a^-1-7/24 = 0
-23/3*a^1-1*a^-1-7/24*a^0 = 0
(-23/3*a^2-7/24*a^1-1*a^0)/(a^1) = 0 // * a^2
a^1*(-23/3*a^2-7/24*a^1-1*a^0) = 0
a^1
(-23/3)*a^2+(-7/24)*a-1 = 0
(-23/3)*a^2+(-7/24)*a-1 = 0
DELTA = (-7/24)^2-(-1*4*(-23/3))
DELTA = -17615/576
DELTA < 0
a in { }
a belongs to the empty set
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