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n in (-oo:+oo)
5/20 = n/48 // - n/48
5/20-(n/48) = 0
1/4-1/48*n = 0 // - 1/4
-1/48*n = -1/4 // : -1/48
n = -1/4/(-1/48)
n = 12
n = 12
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