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x in (-oo:+oo)
(x-(4/9))*(x-(7/9)) = 0
(x-4/9)*(x-7/9) = 0
( x-4/9 )
x-4/9 = 0 // + 4/9
x = 4/9
( x-7/9 )
x-7/9 = 0 // + 7/9
x = 7/9
x in { 4/9, 7/9 }
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