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You can check on Coinmarketcap on which exchanges they are traded and exchange them for BTC there: https://coinmarketcap.com/currencies/presearch/markets/

Coin Marketplace

STEEM 0.04
TRX 0.32
JST 0.081
BTC 59571.00
ETH 1563.34
USDT 1.00
SBD 0.42