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x in (-oo:+oo)
5/8-((7/4)*x) > 3/2 // - 3/2
5/8-((7/4)*x)-(3/2) > 0
(-7/4)*x+5/8-3/2 > 0
-7/4*x-7/8 > 0 // + 7/8
-7/4*x > 7/8 // : -7/4
x < 7/8/(-7/4)
x < -1/2
x in (-oo:-1/2)
(-oo:-1/2)
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