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n in (-oo:+oo)
n/12 = 441/21 // - 441/21
n/12-(441/21) = 0
n/12-21 = 0
1/12*n-21 = 0 // + 21
1/12*n = 21 // : 1/12
n = 21/1/12
n = 252
n = 252
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