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n in (-oo:+oo)
(-1/9)*(n-1) = (1/5)*(n-(2/3)) // - (1/5)*(n-(2/3))
(-1/9)*(n-1)-((1/5)*(n-(2/3))) = 0
(-1/9)*(n-1)+(-1/5)*(n-2/3) = 0
-1/9*(n-1)-1/5*(n-2/3) = 0
-1/9*(n-1)-1/5*(n-2/3) = 0
(-1/5-1/9)*n+1/9+2/15 = 0
(-1/5-1/9)*n+1/9+2/15 = 0
(-1/5-1/9)*n+1/9+2/15 = 0 // - 1/9+2/15
(-1/5-1/9)*n = -(1/9+2/15) // : -1/5-1/9
n = (-(1/9+2/15))/(-1/5-1/9)
n = -((-1/5-1/9)^-1*(1/9+2/15))
n = -((-1/5-1/9)^-1*(1/9+2/15))
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