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n in (-oo:+oo)
(2/3)*n+(3/5)*n+1 = 298/165 // - 298/165
(2/3)*n+(3/5)*n-(298/165)+1 = 0
(2/3)*n+(3/5)*n-298/165+1 = 0
19/15*n-133/165 = 0 // + 133/165
19/15*n = 133/165 // : 19/15
n = 133/165/19/15
n = 7/11
n = 7/11
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