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x in (-oo:+oo)
x/6-9 = 7/12 // - 7/12
x/6-(7/12)-9 = 0
x/6-7/12-9 = 0
1/6*x-115/12 = 0 // + 115/12
1/6*x = 115/12 // : 1/6
x = 115/12/1/6
x = 115/2
x = 115/2
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