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x in (-oo:+oo)
1-((9/5)*x) > 8 // - 8
1-((9/5)*x)-8 > 0
(-9/5)*x-8+1 > 0
-9/5*x-7 > 0 // + 7
-9/5*x > 7 // : -9/5
x < 7/(-9/5)
x < -35/9
x in (-oo:-35/9)
(-oo:-35/9)
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