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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 0.21
TRX 0.20
JST 0.034
BTC 91785.29
ETH 3117.82
USDT 1.00
SBD 3.00