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n in (-oo:+oo)
2-(2*n) = 14 // - 14
2-(2*n)-14 = 0
2-2*n-14 = 0
-2*n-12 = 0 // + 12
-2*n = 12 // : -2
n = 12/(-2)
n = -6
n = -6
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