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x in (-oo:+oo)
x/12-9 = 5/24 // - 5/24
x/12-(5/24)-9 = 0
x/12-5/24-9 = 0
1/12*x-221/24 = 0 // + 221/24
1/12*x = 221/24 // : 1/12
x = 221/24/1/12
x = 221/2
x = 221/2
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