Question

$a) 19 + {( - 3 + 9)} = {19 + ( - 3)} + 9$

Answer 1

foe better result find on google 

Answer 2

see actually they are true since there is normal addition and subtraction you may remove all the brackets from the ques and then solve otherwise if there has been × or ÷ then it would have to be solved.
Hope it helps

......