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