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x in (-oo:+oo)
(x+2/3)*(x-9) = 0
( x+2/3 )
x+2/3 = 0 // - 2/3
x = -2/3
( x-9 )
x-9 = 0 // + 9
x = 9
x in { -2/3, 9 }
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