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