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n in (-oo:+oo)
7/12 = n/6 // - n/6
7/12-(n/6) = 0
7/12-1/6*n = 0 // - 7/12
-1/6*n = -7/12 // : -1/6
n = -7/12/(-1/6)
n = 7/2
n = 7/2
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