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x in (-oo:+oo)
(1/2)*(x-9) = (1/3)*(2*x-1) // - (1/3)*(2*x-1)
(1/2)*(x-9)-((1/3)*(2*x-1)) = 0
(1/2)*(x-9)+(-1/3)*(2*x-1) = 0
1/2*(x-9)-1/3*(2*x-1) = 0
1/2*(x-9)-1/3*(2*x-1) = 0
-1/6*x-25/6 = 0
-1/6*x-25/6 = 0
-1/6*x-25/6 = 0 // + 25/6
-1/6*x = 25/6 // : -1/6
x = 25/6/(-1/6)
x = -25
x = -25
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