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n in (-oo:+oo)
n/12 = 5/15 // - 5/15
n/12-(5/15) = 0
n/12-1/3 = 0
1/12*n-1/3 = 0 // + 1/3
1/12*n = 1/3 // : 1/12
n = 1/3/1/12
n = 4
n = 4
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