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x in (-oo:+oo)
(-4/7)*x > -16 // + 16
(-4/7)*x+16 > 0
16-4/7*x > 0 // - 16
-4/7*x > -16 // : -4/7
x < -16/(-4/7)
x < 28
x in (-oo:28)
(-oo:28)
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