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X in (-oo:+oo)
X/2 = 1.2 // - 1.2
X/2-1.2 = 0
1/2*X-1.2 = 0 // + 1.2
1/2*X = 1.2 // : 1/2
X = 1.2/1/2
X = 2.4
X = 2.4
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