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x in (-oo:+oo)
-x/3 >= 10/9 // - 10/9
-x/3-(10/9) >= 0
-x/3-10/9 >= 0
-1/3*x-10/9 >= 0 // + 10/9
-1/3*x >= 10/9 // : -1/3
x <= 10/9/(-1/3)
x <= -10/3
x in (-oo:-10/3>
(-oo:-10/3>
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