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x in (-oo:+oo)
5/6 = x+2/3 // - x+2/3
5/6-x-(2/3) = 0
5/6-x-2/3 = 0
1/6-x = 0 // - 1/6
-x = -1/6 // * -1
x = 1/6
x = 1/6
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