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n in (-oo:+oo)
4/1 = n/10 // - n/10
4/1-(n/10) = 0
4-(n/10) = 0
4-1/10*n = 0 // - 4
-1/10*n = -4 // : -1/10
n = -4/(-1/10)
n = 40
n = 40
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