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n in (-oo:+oo)
(2/5)*n-(2*n)+4/9 = 164/45 // - 164/45
(2/5)*n-(2*n)+4/9-(164/45) = 0
(2/5)*n-2*n+4/9-164/45 = 0
-8/5*n-16/5 = 0 // + 16/5
-8/5*n = 16/5 // : -8/5
n = 16/5/(-8/5)
n = -2
n = -2
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