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n in (-oo:+oo)
7/15 = n/6 // - n/6
7/15-(n/6) = 0
7/15-1/6*n = 0 // - 7/15
-1/6*n = -7/15 // : -1/6
n = -7/15/(-1/6)
n = 14/5
n = 14/5
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