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X in (-oo:+oo)
X/6 = 12/18 // - 12/18
X/6-(12/18) = 0
X/6-2/3 = 0
1/6*X-2/3 = 0 // + 2/3
1/6*X = 2/3 // : 1/6
X = 2/3/1/6
X = 4
X = 4
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