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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
a-(5/a)-7 = 0
a-5*a^-1-7 = 0
1*a^1-5*a^-1-7*a^0 = 0
(1*a^2-7*a^1-5*a^0)/(a^1) = 0 // * a^2
a^1*(1*a^2-7*a^1-5*a^0) = 0
a^1
a^2-7*a-5 = 0
a^2-7*a-5 = 0
DELTA = (-7)^2-(-5*1*4)
DELTA = 69
DELTA > 0
a = (69^(1/2)+7)/(1*2) or a = (7-69^(1/2))/(1*2)
a = (69^(1/2)+7)/2 or a = (7-69^(1/2))/2
a in { (7-69^(1/2))/2, (69^(1/2)+7)/2}
a in { (7-69^(1/2))/2, (69^(1/2)+7)/2 }
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