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n in (-oo:+oo)
8/15 = (8*n)/3 // - (8*n)/3
8/15-((8*n)/3) = 0
(-8/3)*n+8/15 = 0
8/15-8/3*n = 0 // - 8/15
-8/3*n = -8/15 // : -8/3
n = -8/15/(-8/3)
n = 1/5
n = 1/5
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