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x in (-oo:+oo)
(-2/3)*(x-(2/3)) = (1/9)*(x-(1/2)) // - (1/9)*(x-(1/2))
(-2/3)*(x-(2/3))-((1/9)*(x-(1/2))) = 0
(-2/3)*(x-2/3)+(-1/9)*(x-1/2) = 0
-2/3*(x-2/3)-1/9*(x-1/2) = 0
-2/3*(x-2/3)-1/9*(x-1/2) = 0
1/2-7/9*x = 0
1/2-7/9*x = 0
1/2-7/9*x = 0 // - 1/2
-7/9*x = -1/2 // : -7/9
x = -1/2/(-7/9)
x = 9/14
x = 9/14
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