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x in (-oo:+oo)
(3/8)*x >= 9*x-8 // - 9*x-8
(3/8)*x-(9*x)+8 >= 0
(3/8)*x-9*x+8 >= 0
8-69/8*x >= 0 // - 8
-69/8*x >= -8 // : -69/8
x <= -8/(-69/8)
x <= 64/69
x in (-oo:64/69>
(-oo:64/69>
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