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