[tex]a)\ \ a-(-b+1)+1=a+b-1+1=a+b\\\\b)\ \ (a-1)-(b-1)=a-1-b+1=a-b[/tex]
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[tex]a)\ \ a-(-b+1)+1=a+b-1+1=a+b\\\\b)\ \ (a-1)-(b-1)=a-1-b+1=a-b[/tex]