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n in (-oo:+oo)
(4/5)*n = 1/2 // - 1/2
(4/5)*n-(1/2) = 0
(4/5)*n-1/2 = 0
4/5*n-1/2 = 0 // + 1/2
4/5*n = 1/2 // : 4/5
n = 1/2/4/5
n = 5/8
n = 5/8
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