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n in (-oo:+oo)
(2/5)*n-(1/2) = -5/8 // + -5/8
(2/5)*n-(1/2)-(-5/8) = 0
(2/5)*n-1/2+5/8 = 0
2/5*n+1/8 = 0 // - 1/8
2/5*n = -1/8 // : 2/5
n = -1/8/2/5
n = -5/16
n = -5/16
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