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n in (-oo:+oo)
38 = 2*n+2*n-2 // - 2*n+2*n-2
2-(2*n)-(2*n)+38 = 0
2-2*n-2*n+38 = 0
40-4*n = 0 // - 40
-4*n = -40 // : -4
n = -40/(-4)
n = 10
n = 10
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