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n in (-oo:+oo)
20/15 = n/6 // - n/6
20/15-(n/6) = 0
4/3-1/6*n = 0 // - 4/3
-1/6*n = -4/3 // : -1/6
n = -4/3/(-1/6)
n = 8
n = 8
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