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n in (-oo:+oo)
3/9 = n/6 // - n/6
3/9-(n/6) = 0
1/3-1/6*n = 0 // - 1/3
-1/6*n = -1/3 // : -1/6
n = -1/3/(-1/6)
n = 2
n = 2
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