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n in (-oo:+oo)
n/12 = 7/3 // - 7/3
n/12-(7/3) = 0
n/12-7/3 = 0
1/12*n-7/3 = 0 // + 7/3
1/12*n = 7/3 // : 1/12
n = 7/3/1/12
n = 28
n = 28
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