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n in (-oo:+oo)
(-2/9)*(3/9-n) = (2/9)*n-(5/9) // - (2/9)*n-(5/9)
(-2/9)*(3/9-n)-((2/9)*n)+5/9 = 0
(-2/9)*(3/9-n)+(-2/9)*n+5/9 = 0
(-2*n)/9-2/9*(1/3-n)+5/9 = 0
(-2/9*9*(1/3-n))/9+(-2*n)/9+5/9 = 0
5-2/9*9*(1/3-n)-2*n = 0
5-2/3 = 0
13/3 = 0
13/3/9 = 0
13/3/9 = 0 // * 9
13/3 = 0
n belongs to the empty set
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