a) (2736-75)-2736
= (2736-2736)-75
=0-75=-75
b) (-2002)-(57-2002)
=(-2002)-57+2002
=((-2002)+2002)-57
=0-57=-57
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a) (2736-75)-2736
= (2736-2736)-75
=0-75=-75
b) (-2002)-(57-2002)
=(-2002)-57+2002
=((-2002)+2002)-57
=0-57=-57