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