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x in (-oo:+oo)
x-x-(11/2)+9 = x // - x
x-x-x-(11/2)+9 = 0
x-x-x-11/2+9 = 0
7/2-x = 0 // - 7/2
-x = -7/2 // * -1
x = 7/2
x = 7/2
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