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