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D( a )
a+1 = 0
a+1 = 0
a+1 = 0
a+1 = 0 // - 1
a = -1
a in (-oo:-1) U (-1:+oo)
2-((5/2)*a) = (2*a)/(a+1) // - (2*a)/(a+1)
2-((2*a)/(a+1))-((5/2)*a) = 0
(-5/2)*a-2*a*(a+1)^-1+2 = 0
(-2*a)/(a+1)+(-5*a)/2+2 = 0
(-2*2*a)/(2*(a+1))+(-5*a*(a+1))/(2*(a+1))+(2^2*(a+1))/(2*(a+1)) = 0
2^2*(a+1)-5*a*(a+1)-2*2*a = 0
4*a-5*a^2-9*a+4 = 0
4-5*a^2-5*a = 0
4-5*a^2-5*a = 0
4-5*a^2-5*a = 0
DELTA = (-5)^2-(-5*4*4)
DELTA = 105
DELTA > 0
a = (105^(1/2)+5)/(-5*2) or a = (5-105^(1/2))/(-5*2)
a = (105^(1/2)+5)/(-10) or a = (5-105^(1/2))/(-10)
(a-((105^(1/2)+5)/(-10)))*(a-((5-105^(1/2))/(-10))) = 0
((a-((105^(1/2)+5)/(-10)))*(a-((5-105^(1/2))/(-10))))/(2*(a+1)) = 0
((a-((105^(1/2)+5)/(-10)))*(a-((5-105^(1/2))/(-10))))/(2*(a+1)) = 0 // * 2*(a+1)
(a-((105^(1/2)+5)/(-10)))*(a-((5-105^(1/2))/(-10))) = 0
( a-((105^(1/2)+5)/(-10)) )
a-((105^(1/2)+5)/(-10)) = 0 // + (105^(1/2)+5)/(-10)
a = (105^(1/2)+5)/(-10)
( a-((5-105^(1/2))/(-10)) )
a-((5-105^(1/2))/(-10)) = 0 // + (5-105^(1/2))/(-10)
a = (5-105^(1/2))/(-10)
a in { (105^(1/2)+5)/(-10), (5-105^(1/2))/(-10) }
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