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Así que multiplicamos en aspa y restamos, e igualamos al -2
-2(n) - 2(-4) = -2
-2n -(-8) = -2
-2n + 8 = -2
8 + 2 = 2n
10 = 2n
10/2 = n
5 = n
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K = (- 2)n - 2(- 4) = - 2
- 2n + 8 = - 2
- 2n = - 8 - 2
- 2n = - 10
2n = 10
n = 10 / 2
n = 5