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n in (-oo:+oo)
4/9-((5/6)*n) = (-1/5)*n-(359/90) // - (-1/5)*n-(359/90)
4/9-((5/6)*n)-((-1/5)*n)+359/90 = 0
(-5/6)*n+(1/5)*n+4/9+359/90 = 0
133/30-19/30*n = 0 // - 133/30
-19/30*n = -133/30 // : -19/30
n = -133/30/(-19/30)
n = 7
n = 7
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