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X in (-oo:+oo)
X/8 = 5/40 // - 5/40
X/8-(5/40) = 0
X/8-1/8 = 0
1/8*X-1/8 = 0 // + 1/8
1/8*X = 1/8 // : 1/8
X = 1/8/1/8
X = 1
X = 1
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