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The victory lifted Brazil to fourth in the standings with 13 points.
The Copa America champions looked dominant and untroubled by the absence of talismans Lionel Messi and Angel Di Maria, who received a tribute at the Monumental stadium after his international retirement.
The defending champions had to wait until the 88th minute for the winner.
His performance in goal made it an even more special night for the former Barcelona and Manchester City goalkeeper, who at 41 years, 2 months and 16 days became the oldest-ever Copa America player.
The fires were the worst natural disaster to strike the South American nation since the 2010 earthquake and tsunami that left more than 500 dead.
"We are together, all of us, fighting the emergency. The priority is to save lives," President Gabriel Boric said.
The event drew 30,000 fans who celebrated the return of the 36-year-old midfielder, who joined the club last month.
The technique, also used in Portugal and Spain, relies on grazing goats to control dry pastures and other vegetation that fuel forest fires in the summer.
Rodolfo Reyes, a Neruda nephew, reiterated this week claims that his uncle - a member of the Communist party and the most important Chilean intellectual of the time - was poisoned.
Chile said it had proof that Barcelona of Guayaquil full-back Byron Castillo was born in Tumaco, Colombia, in 1995 and not in the Ecuadorean city of General Villamil Playas in 1998 as stated on his official papers.
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