Third pair vs a river shove: call or fold?

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1. 0:00River. The button shoves.
2. 0:01You have eight-seven suited, on five, seven, nine, three, jack. Third pair. Your hand just turned into a bluff catcher. Call, or fold?
3. 0:10Three-bet pot.
4. 0:11You check the flop. They bet, you call.
5. 0:13You check the turn. They bet, you call.
6. 0:15The river: a jack. You check, and they shove: sixty into eighty-one.
7. 0:20To call, you need thirty percent.
8. 0:22The solver calls this hand every time. Its equity: thirty-one percent. More than the price.