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n in (-oo:+oo)
(2/5)*n+200 = 8400 // - 8400
(2/5)*n-8400+200 = 0
2/5*n-8200 = 0 // + 8200
2/5*n = 8200 // : 2/5
n = 8200/2/5
n = 20500
n = 20500
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