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n in (-oo:+oo)
28 = 2*n+7*n-8 // - 2*n+7*n-8
8-(2*n)-(7*n)+28 = 0
8-2*n-7*n+28 = 0
36-9*n = 0 // - 36
-9*n = -36 // : -9
n = -36/(-9)
n = 4
n = 4
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