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n in (-oo:+oo)
(2/9)*n+1/2 = (2/3)*(n+3) // - (2/3)*(n+3)
(2/9)*n-((2/3)*(n+3))+1/2 = 0
(-2/3)*(n+3)+(2/9)*n+1/2 = 0
(2*n)/9-2/3*(n+3)+1/2 = 0
(-2/3*2*9*(n+3))/(2*9)+(2*2*n)/(2*9)+(1*9)/(2*9) = 0
2*2*n-2/3*2*9*(n+3)+1*9 = 0
9-8*n-36 = 0
-8*n-27 = 0
(-8*n-27)/(2*9) = 0
(-8*n-27)/(2*9) = 0 // * 2*9
-8*n-27 = 0
-8*n-27 = 0 // + 27
-8*n = 27 // : -8
n = 27/(-8)
n = -27/8
n = -27/8
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