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n in (-oo:+oo)
(1/2)*n+7*n+2/5 = 377/5 // - 377/5
(1/2)*n+7*n+2/5-(377/5) = 0
(1/2)*n+7*n+2/5-377/5 = 0
15/2*n-75 = 0 // + 75
15/2*n = 75 // : 15/2
n = 75/15/2
n = 10
n = 10
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