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n in (-oo:+oo)
(1/5)*(5+15) = 8*n-9 // - 8*n-9
(1/5)*(5+15)-(8*n)+9 = 0
(1/5)*(5+15)-8*n+9 = 0
13-8*n = 0 // - 13
-8*n = -13 // : -8
n = -13/(-8)
n = 13/8
n = 13/8
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