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n in (-oo:+oo)
7/9 = n/63 // - n/63
7/9-(n/63) = 0
7/9-1/63*n = 0 // - 7/9
-1/63*n = -7/9 // : -1/63
n = -7/9/(-1/63)
n = 49
n = 49
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