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X in (-oo:+oo)
X/2 = 7/2 // - 7/2
X/2-(7/2) = 0
X/2-7/2 = 0
1/2*X-7/2 = 0 // + 7/2
1/2*X = 7/2 // : 1/2
X = 7/2/1/2
X = 7
X = 7
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