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n in (-oo:+oo)
16/12 = n/42 // - n/42
16/12-(n/42) = 0
4/3-1/42*n = 0 // - 4/3
-1/42*n = -4/3 // : -1/42
n = -4/3/(-1/42)
n = 56
n = 56
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