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X in (-oo:+oo)
X/2-5.5 = 1 // - 1
X/2-5.5-1 = 0
1/2*X-6.5 = 0 // + 6.5
1/2*X = 6.5 // : 1/2
X = 6.5/1/2
X = 13
X = 13
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