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n in (-oo:+oo)
n/12 = 2/3 // - 2/3
n/12-(2/3) = 0
n/12-2/3 = 0
1/12*n-2/3 = 0 // + 2/3
1/12*n = 2/3 // : 1/12
n = 2/3/1/12
n = 8
n = 8
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