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n in (-oo:+oo)
3/7 = n/282 // - n/282
3/7-(n/282) = 0
3/7-1/282*n = 0 // - 3/7
-1/282*n = -3/7 // : -1/282
n = -3/7/(-1/282)
n = 846/7
n = 846/7
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