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x in (-oo:+oo)
7-((5/4)*x) > -7 // + 7
7-((5/4)*x)+7 > 0
(-5/4)*x+7+7 > 0
14-5/4*x > 0 // - 14
-5/4*x > -14 // : -5/4
x < -14/(-5/4)
x < 56/5
x in (-oo:56/5)
(-oo:56/5)
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