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n in (-oo:+oo)
1/8 = n/40 // - n/40
1/8-(n/40) = 0
1/8-1/40*n = 0 // - 1/8
-1/40*n = -1/8 // : -1/40
n = -1/8/(-1/40)
n = 5
n = 5
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