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n in (-oo:+oo)
4/8 = n/20 // - n/20
4/8-(n/20) = 0
1/2-1/20*n = 0 // - 1/2
-1/20*n = -1/2 // : -1/20
n = -1/2/(-1/20)
n = 10
n = 10
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