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n in (-oo:+oo)
8/35 = (4*n)/7 // - (4*n)/7
8/35-((4*n)/7) = 0
(-4/7)*n+8/35 = 0
8/35-4/7*n = 0 // - 8/35
-4/7*n = -8/35 // : -4/7
n = -8/35/(-4/7)
n = 2/5
n = 2/5
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