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n in (-oo:+oo)
8-(5*n) = 28 // - 28
8-(5*n)-28 = 0
8-5*n-28 = 0
-5*n-20 = 0 // + 20
-5*n = 20 // : -5
n = 20/(-5)
n = -4
n = -4
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