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n in (-oo:+oo)
18/(-13) = n/31 // - n/31
18/(-13)-(n/31) = 0
-1/31*n-18/13 = 0 // + 18/13
-1/31*n = 18/13 // : -1/31
n = 18/13/(-1/31)
n = -558/13
n = -558/13
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