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x in (-oo:+oo)
x/8 < 7/9 // - 7/9
x/8-(7/9) < 0
x/8-7/9 < 0
1/8*x-7/9 < 0 // + 7/9
1/8*x < 7/9 // : 1/8
x < 7/9/1/8
x < 56/9
x in (-oo:56/9)
(-oo:56/9)
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