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