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x in (-oo:+oo)
(-4/5)*x < 8 // - 8
(-4/5)*x-8 < 0
-4/5*x-8 < 0 // + 8
-4/5*x < 8 // : -4/5
x > 8/(-4/5)
x > -10
x in (-10:+oo)
(-10:+oo)
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