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X in (-oo:+oo)
X/27 = 27/81 // - 27/81
X/27-(27/81) = 0
X/27-1/3 = 0
1/27*X-1/3 = 0 // + 1/3
1/27*X = 1/3 // : 1/27
X = 1/3/1/27
X = 9
X = 9
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