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