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Remove all grouping symbols and combine like terms, a - { a - [ a- (2a - b) + 3a ]}
[tex]a -\{ a - [ a- (2a - b) + 3a ]\}=\\
a -\{ a - [ a- 2a + b + 3a ]\}=\\
a -\{ a - [ 2a+b ]\}=\\
a -\{ a - 2a - b \}=\\
a -\{ - a- b \}=\\
a+a+b=\\
2a+b[/tex]
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