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n in (-oo:+oo)
(4/5)*n = 0.625 // - 0.625
(4/5)*n-0.625 = 0
4/5*n-0.625 = 0 // + 0.625
4/5*n = 0.625 // : 4/5
n = 0.625/4/5
n = 0.78125
n = 0.78125
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