Compute the following :

$open square brackets table row straight a straight b row cell negative straight b end cell straight a end table close square brackets plus open square brackets table row straight a straight b row straight b straight a end table close square brackets$

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Solution

open square brackets table row straight a straight b row cell negative straight b end cell straight a end table close square brackets plus open square brackets table row straight a straight b row straight b straight a end table close square brackets equals open square brackets table row cell straight a plus straight a end cell cell straight b plus straight b end cell row cell negative straight b plus straight b end cell cell straight a plus straight a end cell end table close square brackets equals open square brackets table row cell 2 straight a end cell cell 2 straight b end cell row 0 cell 2 straight a end cell end table close square brackets

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