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