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X in (-oo:+oo)
X/0.2 = 8.2 // - 8.2
X/0.2-8.2 = 0
5*X-8.2 = 0 // + 8.2
5*X = 8.2 // : 5
X = 8.2/5
X = 1.64
X = 1.64
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