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X in (-oo:+oo)
X/2-6 = 2.5 // - 2.5
X/2-6-2.5 = 0
1/2*X-8.5 = 0 // + 8.5
1/2*X = 8.5 // : 1/2
X = 8.5/1/2
X = 17
X = 17
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