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x in (-oo:+oo)
7-((9/5)*x) > -8 // + 8
7-((9/5)*x)+8 > 0
(-9/5)*x+7+8 > 0
15-9/5*x > 0 // - 15
-9/5*x > -15 // : -9/5
x < -15/(-9/5)
x < 25/3
x in (-oo:25/3)
(-oo:25/3)
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