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n in (-oo:+oo)
3/5 = n/20 // - n/20
3/5-(n/20) = 0
3/5-1/20*n = 0 // - 3/5
-1/20*n = -3/5 // : -1/20
n = -3/5/(-1/20)
n = 12
n = 12
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