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