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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 0.14
TRX 0.25
JST 0.035
BTC 94367.84
ETH 1805.62
USDT 1.00
SBD 0.84