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x in (-oo:+oo)
(7/9)*x-2 < 13/9-x // - 13/9-x
(7/9)*x+x-(13/9)-2 < 0
(7/9)*x+x-13/9-2 < 0
16/9*x-31/9 < 0 // + 31/9
16/9*x < 31/9 // : 16/9
x < 31/9/16/9
x < 31/16
x in (-oo:31/16)
(-oo:31/16)
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