LONDON, June 15 (Reuters) - European equities were expected to open higher on Friday, tracking gains in the U.S. and Asia overnight, after G20 officials told Reuters that top global central banks are ready to step in if needed to stabilise global financial markets after this weekend's Greek elections. Ahead of the polls - which could determine whether Greece stays in the euro zone or exits with unpredictable contagion risks for the region - investors have been taking all bets off the table,

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