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x in (-oo:+oo)
7-((2*x)/5) < 9 // - 9
7-((2*x)/5)-9 < 0
(-2/5)*x-9+7 < 0
-2/5*x-2 < 0 // + 2
-2/5*x < 2 // : -2/5
x > 2/(-2/5)
x > -5
x in (-5:+oo)
(-5:+oo)
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