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D( a )
2*a^2-(4*a)-6 = 0
2*a^2-(4*a)-6 = 0
2*a^2-(4*a)-6 = 0
2*a^2-4*a-6 = 0
2*a^2-4*a-6 = 0
DELTA = (-4)^2-(-6*2*4)
DELTA = 64
DELTA > 0
a = (64^(1/2)+4)/(2*2) or a = (4-64^(1/2))/(2*2)
a = 3 or a = -1
a in (-oo:-1) U (-1:3) U (3:+oo)
1/(2*a^2-(4*a)-6) = (a+2)/(2*a^2-(4*a)-6)-1 // - (a+2)/(2*a^2-(4*a)-6)-1
1/(2*a^2-(4*a)-6)-((a+2)/(2*a^2-(4*a)-6))+1 = 0
1/(2*a^2-4*a-6)-((a+2)/(2*a^2-4*a-6))+1 = 0
1/(2*a^2-4*a-6)+(-1*(a+2))/(2*a^2-4*a-6)+1 = 0
2*a^2-4*a-6 = 0
2*a^2-4*a-6 = 0
2*(a^2-2*a-3) = 0
a^2-2*a-3 = 0
DELTA = (-2)^2-(-3*1*4)
DELTA = 16
DELTA > 0
a = (16^(1/2)+2)/(1*2) or a = (2-16^(1/2))/(1*2)
a = 3 or a = -1
2*(a+1)*(a-3) = 0
1/(2*(a+1)*(a-3))+(-1*(a+2))/(2*(a+1)*(a-3))+1 = 0
1/(2*(a+1)*(a-3))+(-1*(a+2))/(2*(a+1)*(a-3))+(1*2*(a+1)*(a-3))/(2*(a+1)*(a-3)) = 0
1*2*(a+1)*(a-3)-1*(a+2)+1 = 0
2*a^2-a-4*a-6-1 = 0
2*a^2-5*a-7 = 0
2*a^2-5*a-7 = 0
2*a^2-5*a-7 = 0
DELTA = (-5)^2-(-7*2*4)
DELTA = 81
DELTA > 0
a = (81^(1/2)+5)/(2*2) or a = (5-81^(1/2))/(2*2)
a = 7/2 or a = -1
(a+1)*(a-7/2) = 0
((a+1)*(a-7/2))/(2*(a+1)*(a-3)) = 0
((a+1)*(a-7/2))/(2*(a+1)*(a-3)) = 0 // * 2*(a+1)*(a-3)
(a+1)*(a-7/2) = 0
( a+1 )
a+1 = 0 // - 1
a = -1
( a-7/2 )
a-7/2 = 0 // + 7/2
a = 7/2
a in { -1}
a = 7/2
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