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X in (-oo:+oo)
X/12 = 9/20 // - 9/20
X/12-(9/20) = 0
X/12-9/20 = 0
1/12*X-9/20 = 0 // + 9/20
1/12*X = 9/20 // : 1/12
X = 9/20/1/12
X = 27/5
X = 27/5
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