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x in (-oo:+oo)
0 = x*((x-9)/5) // - x*((x-9)/5)
0-(x*((x-9)/5)) = 0
-(x*((x-9)/5)) = 0
(-1*x*(x-9))/5 = 0
( -1 )
-1 = 0
x belongs to the empty set
( x-9 )
x-9 = 0 // + 9
x = 9
( x )
x = 0
x in { 9, 0 }
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