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X in (-oo:+oo)
X/12 = 5/7 // - 5/7
X/12-(5/7) = 0
X/12-5/7 = 0
1/12*X-5/7 = 0 // + 5/7
1/12*X = 5/7 // : 1/12
X = 5/7/1/12
X = 60/7
X = 60/7
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