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Answer :

Answer:

8

Step-by-step explanation:

Answer:

he should have first preformed oprations in the pratheses so he should have done (3+12/3) first to get 3*(3+4)-4 then do (3+4) and have 3*7-4 next he should do 3*7 and get 21-4 do that and get the answer 17

Step-by-step explanation: