Respuesta :

12 - 15 ÷ 3 + 9

Following BODMAS = Bracket Order Division Multiplication Addition Subtraction

Division comes before Addition and Subtraction, so we carry out Division first.

12 - 15 ÷ 3 + 9,                15 ÷ 3 = 5

12 - 5 + 9                   

7 + 9

16

I hope you find this explanation useful.