ok :) we should do according to order of operations
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction (PEMDAS) 'it will be helpful for to remember '
anyways ;
9×23=207
3×39=117
(we did those things because we should multiple before add )
so now we will add and subtract= 207+117-28 =296
I HOPE IT WILL MAKE SENSE !!!!!!!