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X in (-oo:+oo)
X/12 = 20/31 // - 20/31
X/12-(20/31) = 0
X/12-20/31 = 0
1/12*X-20/31 = 0 // + 20/31
1/12*X = 20/31 // : 1/12
X = 20/31/1/12
X = 240/31
X = 240/31
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