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X in (-oo:+oo)
X/2 = 5.12 // - 5.12
X/2-5.12 = 0
1/2*X-5.12 = 0 // + 5.12
1/2*X = 5.12 // : 1/2
X = 5.12/1/2
X = 10.24
X = 10.24
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