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n in (-oo:+oo)
(-1/8)*(n+6) = (-1/9)*(n+2) // - (-1/9)*(n+2)
(-1/8)*(n+6)-((-1/9)*(n+2)) = 0
(-1/8)*(n+6)+(1/9)*(n+2) = 0
1/9*(n+2)-1/8*(n+6) = 0
1/9*(n+2)-1/8*(n+6) = 0
-1/72*n-19/36 = 0
-1/72*n-19/36 = 0
-1/72*n-19/36 = 0 // + 19/36
-1/72*n = 19/36 // : -1/72
n = 19/36/(-1/72)
n = -38
n = -38
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