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n in (-oo:+oo)
(3/4)*n-(13/10) = 457/80 // - 457/80
(3/4)*n-(13/10)-(457/80) = 0
(3/4)*n-13/10-457/80 = 0
3/4*n-561/80 = 0 // + 561/80
3/4*n = 561/80 // : 3/4
n = 561/80/3/4
n = 187/20
n = 187/20
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