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