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n in (-oo:+oo)
5/6 = n/4 // - n/4
5/6-(n/4) = 0
5/6-1/4*n = 0 // - 5/6
-1/4*n = -5/6 // : -1/4
n = -5/6/(-1/4)
n = 10/3
n = 10/3
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