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x in (-oo:+oo)
x-(9/2) = 1-(x/9) // - 1-(x/9)
x+x/9-(9/2)-1 = 0
x+x/9-9/2-1 = 0
10/9*x-11/2 = 0 // + 11/2
10/9*x = 11/2 // : 10/9
x = 11/2/10/9
x = 99/20
x = 99/20
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