Which loan to pay down 1st?

Which loan is better to pay down 1st?

6% mortgage, $45k balance (on house for sale or rent)
3.25% variable rate, interest-only HELOC, $249k balance (on same house)
5.75% mortgage, $265k balance (primary residence)

Thanks.

I would say the first one,the 6% 45K balance..

You could pay them all by using mortgage modification or loan consolidation.

Thanks. Wouldn't that actually cost more per month because the interest-only loan balance would require principal payments once they were all combined?

I would say the first one,the 6% 45K balance..
Thanks. That would be the highest interest rate and the lowest balance. However, the 3.25% is a variable rate and really makes me nervous with the lifetime cap of 15% which would not be affordable. Eventually, rates will rise again.