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