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n in (-oo:+oo)
(2/5)*n+7/8 = 131/40 // - 131/40
(2/5)*n+7/8-(131/40) = 0
(2/5)*n+7/8-131/40 = 0
2/5*n-12/5 = 0 // + 12/5
2/5*n = 12/5 // : 2/5
n = 12/5/2/5
n = 6
n = 6
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