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n in (-oo:+oo)
(4/5)*n = 4/15 // - 4/15
(4/5)*n-(4/15) = 0
(4/5)*n-4/15 = 0
4/5*n-4/15 = 0 // + 4/15
4/5*n = 4/15 // : 4/5
n = 4/15/4/5
n = 1/3
n = 1/3
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