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X in (-oo:+oo)
X/2 = 4.8 // - 4.8
X/2-4.8 = 0
1/2*X-4.8 = 0 // + 4.8
1/2*X = 4.8 // : 1/2
X = 4.8/1/2
X = 9.6
X = 9.6
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