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n in (-oo:+oo)
7*(2-(4*n)) = -266 // + 266
7*(2-(4*n))+266 = 0
7*(2-4*n)+266 = 0
7*(2-4*n)+266 = 0
280-28*n = 0
280-28*n = 0
280-28*n = 0 // - 280
-28*n = -280 // : -28
n = -280/(-28)
n = 10
n = 10
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