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x in (-oo:+oo)
(1/9)*(x+1/9) = (1/6)*(x-(1/9)) // - (1/6)*(x-(1/9))
(1/9)*(x+1/9)-((1/6)*(x-(1/9))) = 0
(1/9)*(x+1/9)+(-1/6)*(x-1/9) = 0
1/9*(x+1/9)-1/6*(x-1/9) = 0
1/9*(x+1/9)-1/6*(x-1/9) = 0
5/162-1/18*x = 0
5/162-1/18*x = 0
5/162-1/18*x = 0 // - 5/162
-1/18*x = -5/162 // : -1/18
x = -5/162/(-1/18)
x = 5/9
x = 5/9
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