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n in (-oo:+oo)
3/7 = n/42 // - n/42
3/7-(n/42) = 0
3/7-1/42*n = 0 // - 3/7
-1/42*n = -3/7 // : -1/42
n = -3/7/(-1/42)
n = 18
n = 18
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