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D( a )
a+3 = 0
a^2-9 = 0
a-3 = 0
a+3 = 0
a+3 = 0
a+3 = 0 // - 3
a = -3
a^2-9 = 0
a^2-9 = 0
1*a^2 = 9 // : 1
a^2 = 9
a^2 = 9 // ^ 1/2
abs(a) = 3
a = 3 or a = -3
a-3 = 0
a-3 = 0
a-3 = 0 // + 3
a = 3
a in (-oo:-3) U (-3:3) U (3:+oo)
2/(a+3)+5/(a-3) = (6*a)/(a^2-9) // - (6*a)/(a^2-9)
2/(a+3)+5/(a-3)-((6*a)/(a^2-9)) = 0
2/(a+3)+5/(a-3)-6*a*(a^2-9)^-1 = 0
2/(a+3)+5/(a-3)+(-6*a)/(a^2-9) = 0
(2*(a-3)*(a^2-9))/((a+3)*(a-3)*(a^2-9))+(5*(a+3)*(a^2-9))/((a+3)*(a-3)*(a^2-9))+(-6*a*(a+3)*(a-3))/((a+3)*(a-3)*(a^2-9)) = 0
2*(a-3)*(a^2-9)+5*(a+3)*(a^2-9)-6*a*(a+3)*(a-3) = 0
7*a^3-6*a^3+9*a^2-63*a+54*a-81 = 0
a^3+9*a^2-9*a-81 = 0
a^3+9*a^2-9*a-81 = 0
a^3+9*a^2-9*a-81
9*(a^2-9)+a^3-9*a
a*(a^2-9)+9*(a^2-9)
(a+9)*(a^2-9)
((a+9)*(a^2-9))/((a+3)*(a-3)*(a^2-9)) = 0
((a+9)*(a^2-9))/((a+3)*(a-3)*(a^2-9)) = 0 // * (a+3)*(a-3)*(a^2-9)
(a+9)*(a^2-9) = 0
( a+9 )
a+9 = 0 // - 9
a = -9
( a^2-9 )
1*a^2 = 9 // : 1
a^2 = 9
a^2 = 9 // ^ 1/2
abs(a) = 3
a = 3 or a = -3
a in { 3}
a in { -3}
a = -9
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