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n in (-oo:+oo)
4/7 = n/42 // - n/42
4/7-(n/42) = 0
4/7-1/42*n = 0 // - 4/7
-1/42*n = -4/7 // : -1/42
n = -4/7/(-1/42)
n = 24
n = 24
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