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600-[300-(25+x)]=425

Răspuns :

   
[tex]600-[300-(25+x)]=425 \\ -[300-(25+x)]=425 -600 \\ -300+(25+x)= -175 \\ (25+x)= -175+300 \\ 25+x = 125 \\ x=125-25 \\ x = 100\\ x = \boxed{100}[/tex]