Answer: —1/6
Step-by-step explanation: By using BIDMAS we solve the bracket first t we get 12/36 then we simpli it to 1/3
then we solve -1/2 + 1/3 by taking 6 as common denominator we get -3/6 + 2/6 then we add them but cause of the subtraction sign we subtract it and we get -1/6