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n in (-oo:+oo)
n/12 = 5/2 // - 5/2
n/12-(5/2) = 0
n/12-5/2 = 0
1/12*n-5/2 = 0 // + 5/2
1/12*n = 5/2 // : 1/12
n = 5/2/1/12
n = 30
n = 30
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