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n in (-oo:+oo)
5/20 = n/10 // - n/10
5/20-(n/10) = 0
1/4-1/10*n = 0 // - 1/4
-1/10*n = -1/4 // : -1/10
n = -1/4/(-1/10)
n = 5/2
n = 5/2
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