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n in (-oo:+oo)
2*n-(7*n)-2 = 8 // - 8
2*n-(7*n)-8-2 = 0
2*n-7*n-8-2 = 0
-5*n-10 = 0 // + 10
-5*n = 10 // : -5
n = 10/(-5)
n = -2
n = -2
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