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X in (-oo:+oo)
7-((9/5)*X) > 8 // - 8
7-((9/5)*X)-8 > 0
(-9/5)*X-8+7 > 0
-9/5*X-1 > 0 // + 1
-9/5*X > 1 // : -9/5
X < 1/(-9/5)
X < -5/9
X in (-oo:-5/9)
(-oo:-5/9)
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