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x in (-oo:+oo)
7-((4*x)/5) > 3 // - 3
7-((4*x)/5)-3 > 0
(-4/5)*x-3+7 > 0
4-4/5*x > 0 // - 4
-4/5*x > -4 // : -4/5
x < -4/(-4/5)
x < 5
x in (-oo:5)
(-oo:5)
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