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x in (-oo:+oo)
(-4/5)*x > -16 // + 16
(-4/5)*x+16 > 0
16-4/5*x > 0 // - 16
-4/5*x > -16 // : -4/5
x < -16/(-4/5)
x < 20
x in (-oo:20)
(-oo:20)
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