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n in (-oo:+oo)
-1 = 5*n-2*n+8 // - 5*n-2*n+8
-(-2*n)-(5*n)-8-1 = 0
2*n-5*n-8-1 = 0
-3*n-9 = 0 // + 9
-3*n = 9 // : -3
n = 9/(-3)
n = -3
n = -3
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