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n in (-oo:+oo)
3/13 = n/169 // - n/169
3/13-(n/169) = 0
3/13-1/169*n = 0 // - 3/13
-1/169*n = -3/13 // : -1/169
n = -3/13/(-1/169)
n = 39
n = 39
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