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n in (-oo:+oo)
n/12 = 9/18 // - 9/18
n/12-(9/18) = 0
n/12-1/2 = 0
1/12*n-1/2 = 0 // + 1/2
1/12*n = 1/2 // : 1/12
n = 1/2/1/12
n = 6
n = 6
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