a) [tex]\boxed{10 + 10 - 5}[/tex]
b) [tex]\boxed{3 + 2 - 1 + (4 - 5)}[/tex]
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a) [tex]\boxed{10 + 10 - 5}[/tex]
b) [tex]\boxed{3 + 2 - 1 + (4 - 5)}[/tex]