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n in (-oo:+oo)
7/6 = n/18 // - n/18
7/6-(n/18) = 0
7/6-1/18*n = 0 // - 7/6
-1/18*n = -7/6 // : -1/18
n = -7/6/(-1/18)
n = 21
n = 21
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