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