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D( a )
a^2-(2*a) = 0
a^2-4 = 0
a^2-(2*a) = 0
a^2-(2*a) = 0
a^2-2*a = 0
a^2-2*a = 0
DELTA = (-2)^2-(0*1*4)
DELTA = 4
DELTA > 0
a = (4^(1/2)+2)/(1*2) or a = (2-4^(1/2))/(1*2)
a = 2 or a = 0
a^2-4 = 0
a^2-4 = 0
1*a^2 = 4 // : 1
a^2 = 4
a^2 = 4 // ^ 1/2
abs(a) = 2
a = 2 or a = -2
a in (-oo:-2) U (-2:0) U (0:2) U (2:+oo)
(a-1)/(a^2-(2*a))-(a/(a^2-4)) = 0
(a-1)/(a^2-2*a)-(a/(a^2-4)) = 0
(a-1)/(a^2-2*a)+(-1*a)/(a^2-4) = 0
a^2-2*a = 0
a^2-2*a = 0
a*(a-2) = 0
a-2 = 0 // + 2
a = 2
a*(a-2) = 0
(a-1)/(a*(a-2))+(-1*a)/(a^2-4) = 0
((a-1)*(a^2-4))/(a*(a-2)*(a^2-4))+(-1*a^2*(a-2))/(a*(a-2)*(a^2-4)) = 0
(a-1)*(a^2-4)-1*a^2*(a-2) = 0
a^2-4*a+4 = 0
a^2-4*a+4 = 0
a^2-4*a+4 = 0
DELTA = (-4)^2-(1*4*4)
DELTA = 0
a = 4/(1*2)
a = 2 or a = 2
(a-2)^2 = 0
((a-2)^2)/(a*(a-2)*(a^2-4)) = 0
((a-2)^2)/(a*(a-2)*(a^2-4)) = 0 // * a*(a-2)*(a^2-4)
(a-2)^2 = 0
a-2 = 0 // + 2
a = 2
a in { 2}
a belongs to the empty set
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