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n in (-oo:+oo)
3/10 = n/6 // - n/6
3/10-(n/6) = 0
3/10-1/6*n = 0 // - 3/10
-1/6*n = -3/10 // : -1/6
n = -3/10/(-1/6)
n = 9/5
n = 9/5
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