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n in (-oo:+oo)
(2/5)*n+1/4 = 41/4 // - 41/4
(2/5)*n+1/4-(41/4) = 0
(2/5)*n+1/4-41/4 = 0
2/5*n-10 = 0 // + 10
2/5*n = 10 // : 2/5
n = 10/2/5
n = 25
n = 25
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