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X in (-oo:+oo)
X/8 = 9/18 // - 9/18
X/8-(9/18) = 0
X/8-1/2 = 0
1/8*X-1/2 = 0 // + 1/2
1/8*X = 1/2 // : 1/8
X = 1/2/1/8
X = 4
X = 4
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