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