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n in (-oo:+oo)
(1/9)*(n-6) = (2/5)*(n-3) // - (2/5)*(n-3)
(1/9)*(n-6)-((2/5)*(n-3)) = 0
(1/9)*(n-6)+(-2/5)*(n-3) = 0
1/9*(n-6)-2/5*(n-3) = 0
1/9*(n-6)-2/5*(n-3) = 0
8/15-13/45*n = 0
8/15-13/45*n = 0
8/15-13/45*n = 0 // - 8/15
-13/45*n = -8/15 // : -13/45
n = -8/15/(-13/45)
n = 24/13
n = 24/13
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