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n in (-oo:+oo)
18 = 6*n+2*n+2 // - 6*n+2*n+2
18-(6*n)-(2*n)-2 = 0
18-6*n-2*n-2 = 0
16-8*n = 0 // - 16
-8*n = -16 // : -8
n = -16/(-8)
n = 2
n = 2
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