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Mikel Arteta's side won 2-0 at the Emirates to get their season going.
It was a sublime display by Arsenal who wiped off a goal difference deficit to champions Manchester City who they joined on 52 points, although they stay in third place courtesy of scoring fewer goals.
The league leaders posted a comfortable 3-0 win on Sunday.
Thomas Partey and substitutes Ben White and Reiss Nelson -- Nelson's arriving in the seventh minute of stoppage time -- sparked wild scenes of celebration.
Arsenal are top of the Premier League table with five points lead over Manchester City.
The league leaders edged Liverpool 3-1 at the Emirates Stadium in London.
Arsenal defeated Brentford 3-0 to return to the top of the points table.
Gabriel Martinelli scored the first goal before home defender Marc Guehi turned the ball into his own net late on at Selhurst Park.
Arteta took over from Unai Emery in December, 2019, and his previous deal was set to expire at the end of next season.
Arsenal's third successive league win lifted them above West Ham United into fifth place with 45 points, one behind Manchester United but having played two fewer games.
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