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X in (-oo:+oo)
X/8 = 4/2 // - 4/2
X/8-(4/2) = 0
X/8-2 = 0
1/8*X-2 = 0 // + 2
1/8*X = 2 // : 1/8
X = 2/1/8
X = 16
X = 16
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