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n in (-oo:+oo)
2/5-(2*n) = 1 // - 1
2/5-(2*n)-1 = 0
2/5-2*n-1 = 0
-2*n-3/5 = 0 // + 3/5
-2*n = 3/5 // : -2
n = 3/5/(-2)
n = -3/10
n = -3/10
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