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n in (-oo:+oo)
(2/5)*n-((1/4)*n)+8 = 14 // - 14
(2/5)*n-((1/4)*n)-14+8 = 0
(2/5)*n+(-1/4)*n-14+8 = 0
3/20*n-6 = 0 // + 6
3/20*n = 6 // : 3/20
n = 6/3/20
n = 40
n = 40
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