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n in (-oo:+oo)
n/12 = 12/4 // - 12/4
n/12-(12/4) = 0
n/12-3 = 0
1/12*n-3 = 0 // + 3
1/12*n = 3 // : 1/12
n = 3/1/12
n = 36
n = 36
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