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n in (-oo:+oo)
32 = n+7*n+8 // - n+7*n+8
32-n-(7*n)-8 = 0
32-n-7*n-8 = 0
24-8*n = 0 // - 24
-8*n = -24 // : -8
n = -24/(-8)
n = 3
n = 3
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