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