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x in (-oo:+oo)
x*(((x-9)^1)/2) = 0
x*((x-9)/2) = 0
(x*(x-9))/2 = 0
( x-9 )
x-9 = 0 // + 9
x = 9
( x )
x = 0
x in { 9, 0 }
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