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X in (-oo:+oo)
X/72 = 5/12 // - 5/12
X/72-(5/12) = 0
X/72-5/12 = 0
1/72*X-5/12 = 0 // + 5/12
1/72*X = 5/12 // : 1/72
X = 5/12/1/72
X = 30
X = 30
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