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n in (-oo:+oo)
5/3 = n/12 // - n/12
5/3-(n/12) = 0
5/3-1/12*n = 0 // - 5/3
-1/12*n = -5/3 // : -1/12
n = -5/3/(-1/12)
n = 20
n = 20
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