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n in (-oo:+oo)
5-7*n = 7*n-23 // - 7*n-23
5-7*n-(7*n)+23 = 0
5-7*n-7*n+23 = 0
28-14*n = 0 // - 28
-14*n = -28 // : -14
n = -28/(-14)
n = 2
n = 2
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