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