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