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n in (-oo:+oo)
(1/9)*(n+3) = 10/9-n // - 10/9-n
(1/9)*(n+3)+n-(10/9) = 0
(1/9)*(n+3)+n-10/9 = 0
1/9*(n+3)+n-10/9 = 0
(1/9*9*(n+3))/9+(9*n)/9-10/9 = 0
1/9*9*(n+3)+9*n-10 = 0
10*n-10+3 = 0
10*n-7 = 0
(10*n-7)/9 = 0
(10*n-7)/9 = 0 // * 9
10*n-7 = 0
10*n-7 = 0 // + 7
10*n = 7 // : 10
n = 7/10
n = 7/10
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