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x in (-oo:+oo)
(1/3)*(x+2/3) = (1/6)*(x-4) // - (1/6)*(x-4)
(1/3)*(x+2/3)-((1/6)*(x-4)) = 0
(1/3)*(x+2/3)+(-1/6)*(x-4) = 0
1/3*(x+2/3)-1/6*(x-4) = 0
1/3*(x+2/3)-1/6*(x-4) = 0
1/6*x+8/9 = 0
1/6*x+8/9 = 0
1/6*x+8/9 = 0 // - 8/9
1/6*x = -8/9 // : 1/6
x = -8/9/1/6
x = -16/3
x = -16/3
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