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x in (-oo:+oo)
1/3-2*x = 8/3 // - 8/3
1/3-2*x-(8/3) = 0
1/3-2*x-8/3 = 0
-2*x-7/3 = 0 // + 7/3
-2*x = 7/3 // : -2
x = 7/3/(-2)
x = -7/6
x = -7/6
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