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x in (-oo:+oo)
0 = (x-9)/2 // - (x-9)/2
0-((x-9)/2) = 0
-((x-9)/2) = 0
(-1*(x-9))/2 = 0
( -1 )
-1 = 0
x belongs to the empty set
( x-9 )
x-9 = 0 // + 9
x = 9
x = 9
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