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x in (-oo:+oo)
(((5*(x-9))/4)*(x+9))/5 = 0
((x-9)*(x+9))/4 = 0
( x+9 )
x+9 = 0 // - 9
x = -9
( x-9 )
x-9 = 0 // + 9
x = 9
x in { -9, 9 }
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