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n in (-oo:+oo)
6/27 = n/4 // - n/4
6/27-(n/4) = 0
2/9-1/4*n = 0 // - 2/9
-1/4*n = -2/9 // : -1/4
n = -2/9/(-1/4)
n = 8/9
n = 8/9
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