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D( a )
9*a-2 = 0
9*a-2 = 0
9*a-2 = 0
9*a-2 = 0 // + 2
9*a = 2 // : 9
a = 2/9
a in (-oo:2/9) U (2/9:+oo)
a/(9*a-2) = 1/8 // - 1/8
a/(9*a-2)-(1/8) = 0
a/(9*a-2)-1/8 = 0
(8*a)/(8*(9*a-2))+(-1*(9*a-2))/(8*(9*a-2)) = 0
8*a-1*(9*a-2) = 0
2-a = 0
(2-a)/(8*(9*a-2)) = 0
(2-a)/(8*(9*a-2)) = 0 // * 8*(9*a-2)
2-a = 0
2-a = 0 // - 2
-a = -2 // * -1
a = 2
a = 2
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