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n in (-oo:+oo)
(2/9)*n+(1/2)*n = (2/3)*(n+3) // - (2/3)*(n+3)
(2/9)*n-((2/3)*(n+3))+(1/2)*n = 0
(-2/3)*(n+3)+(2/9)*n+(1/2)*n = 0
(2*n)/9-2/3*(n+3)+n/2 = 0
(-2/3*2*9*(n+3))/(2*9)+(2*2*n)/(2*9)+(9*n)/(2*9) = 0
2*2*n-2/3*2*9*(n+3)+9*n = 0
9*n-8*n-36 = 0
n-36 = 0
(n-36)/(2*9) = 0
(n-36)/(2*9) = 0 // * 2*9
n-36 = 0
n-36 = 0 // + 36
n = 36
n = 36
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