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n in (-oo:+oo)
7/9 = n/27 // - n/27
7/9-(n/27) = 0
7/9-1/27*n = 0 // - 7/9
-1/27*n = -7/9 // : -1/27
n = -7/9/(-1/27)
n = 21
n = 21
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