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X in (-oo:+oo)
X/2 = 1.38 // - 1.38
X/2-1.38 = 0
1/2*X-1.38 = 0 // + 1.38
1/2*X = 1.38 // : 1/2
X = 1.38/1/2
X = 2.76
X = 2.76
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