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x in (-oo:+oo)
(-2/7)*x-8 > -3 // + 3
(-2/7)*x-8+3 > 0
-2/7*x-5 > 0 // + 5
-2/7*x > 5 // : -2/7
x < 5/(-2/7)
x < -35/2
x in (-oo:-35/2)
(-oo:-35/2)
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