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x in (-oo:+oo)
x+9/4 = x+9/2-(8/9) // - x+9/2-(8/9)
x-x+9/4-(9/2)+8/9 = 0
x-x+9/4-9/2+8/9 = 0
-49/36 = 0
x belongs to the empty set
x belongs to the empty set
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