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n in (-oo:+oo)
24/56 = n/7 // - n/7
24/56-(n/7) = 0
3/7-1/7*n = 0 // - 3/7
-1/7*n = -3/7 // : -1/7
n = -3/7/(-1/7)
n = 3
n = 3
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