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n in (-oo:+oo)
100/258 = n/645 // - n/645
100/258-(n/645) = 0
50/129-1/645*n = 0 // - 50/129
-1/645*n = -50/129 // : -1/645
n = -50/129/(-1/645)
n = 250
n = 250
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