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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
(5/8)*a+6 = 34/a // - 34/a
(5/8)*a-(34/a)+6 = 0
(5/8)*a-34*a^-1+6 = 0
5/8*a^1-34*a^-1+6*a^0 = 0
(5/8*a^2+6*a^1-34*a^0)/(a^1) = 0 // * a^2
a^1*(5/8*a^2+6*a^1-34*a^0) = 0
a^1
(5/8)*a^2+6*a-34 = 0
(5/8)*a^2+6*a-34 = 0
DELTA = 6^2-(-34*4*(5/8))
DELTA = 121
DELTA > 0
a = (121^(1/2)-6)/(2*(5/8)) or a = (-121^(1/2)-6)/(2*(5/8))
a = 4 or a = -68/5
a in { -68/5, 4}
a in { -68/5, 4 }
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