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n in (-oo:+oo)
n-(5*n)+9 = -23 // + 23
n-(5*n)+9+23 = 0
n-5*n+9+23 = 0
32-4*n = 0 // - 32
-4*n = -32 // : -4
n = -32/(-4)
n = 8
n = 8
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