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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 0.06
TRX 0.31
JST 0.063
BTC 68336.60
ETH 2045.00
USDT 1.00
SBD 0.49