Which debt should I pay down first?

I recenetly received about $1000 from my tax refund. I have three credit cards and a line of credit. Which debt should I pay off first? The
three credit cards have balances of $1700, $2000 and $2900 the line of credit is around $5000. Should I put it all towards one debt or spread it amongst all four?
Which debt should I pay down first?
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