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n in (-oo:+oo)
2/5 = (5/8)*n-4 // - (5/8)*n-4
2/5-((5/8)*n)+4 = 0
(-5/8)*n+2/5+4 = 0
22/5-5/8*n = 0 // - 22/5
-5/8*n = -22/5 // : -5/8
n = -22/5/(-5/8)
n = 176/25
n = 176/25
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