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