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