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x in (-oo:+oo)
x/6-9 = 5/12 // - 5/12
x/6-(5/12)-9 = 0
x/6-5/12-9 = 0
1/6*x-113/12 = 0 // + 113/12
1/6*x = 113/12 // : 1/6
x = 113/12/1/6
x = 113/2
x = 113/2
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