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X in (-oo:+oo)
1-X-(1/2) = 3 // - 3
1-X-(1/2)-3 = 0
1-X-1/2-3 = 0
-X-5/2 = 0 // + 5/2
-X = 5/2 // * -1
X = -5/2
X = -5/2
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