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n in (-oo:+oo)
14/42 = n/18 // - n/18
14/42-(n/18) = 0
1/3-1/18*n = 0 // - 1/3
-1/18*n = -1/3 // : -1/18
n = -1/3/(-1/18)
n = 6
n = 6
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