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n in (-oo:+oo)
6-(7*n) = 23/12 // - 23/12
6-(7*n)-(23/12) = 0
6-7*n-23/12 = 0
49/12-7*n = 0 // - 49/12
-7*n = -49/12 // : -7
n = -49/12/(-7)
n = 7/12
n = 7/12
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