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X in (-oo:+oo)
X/2-5 = 6/4 // - 6/4
X/2-(6/4)-5 = 0
X/2-3/2-5 = 0
1/2*X-13/2 = 0 // + 13/2
1/2*X = 13/2 // : 1/2
X = 13/2/1/2
X = 13
X = 13
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