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n in (-oo:+oo)
8 = (2*n)/5 // - (2*n)/5
8-((2*n)/5) = 0
(-2/5)*n+8 = 0
8-2/5*n = 0 // - 8
-2/5*n = -8 // : -2/5
n = -8/(-2/5)
n = 20
n = 20
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