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n in (-oo:+oo)
5/8 = n/20 // - n/20
5/8-(n/20) = 0
5/8-1/20*n = 0 // - 5/8
-1/20*n = -5/8 // : -1/20
n = -5/8/(-1/20)
n = 25/2
n = 25/2
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