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n in (-oo:+oo)
5/20 = n/60 // - n/60
5/20-(n/60) = 0
1/4-1/60*n = 0 // - 1/4
-1/60*n = -1/4 // : -1/60
n = -1/4/(-1/60)
n = 15
n = 15
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