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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
a+7/a-1+4 = a+(10/2)*a+8 // - a+(10/2)*a+8
a-a-((10/2)*a)+7/a-8-1+4 = 0
a-a-5*a+7/a-8-1+4 = 0
7*a^-1-5*a^1-5*a^0 = 0
(7*a^0-5*a^2-5*a^1)/(a^1) = 0 // * a^2
a^1*(7*a^0-5*a^2-5*a^1) = 0
a^1
7-5*a^2-5*a = 0
7-5*a^2-5*a = 0
DELTA = (-5)^2-(-5*4*7)
DELTA = 165
DELTA > 0
a = (165^(1/2)+5)/(-5*2) or a = (5-165^(1/2))/(-5*2)
a = (165^(1/2)+5)/(-10) or a = (5-165^(1/2))/(-10)
a in { (165^(1/2)+5)/(-10), (5-165^(1/2))/(-10)}
a in { (165^(1/2)+5)/(-10), (5-165^(1/2))/(-10) }
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