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X in (-oo:+oo)
(2/3)*(9-X) = 0
2/3*(9-X) = 0
( 2/3 )
2/3 = 0
X belongs to the empty set
( 9-X )
9-X = 0 // - 9
-X = -9 // * -1
X = 9
X = 9
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