the expression is 48/2(9+3), which consists of just one term so you apply pedmas and then execute from left to right. . .now, since this is just one term, there's nothing to execute from left to right
some of the people here obviously mistake it for 48/2x(9+3), which consists of two (2) multiplicative terms (48/2 and (9+3)) where execution from left to right is applicable, but is not the case for the expression that the ts posted
go back to the expression, it is 48/2(9+3) and not 48/2x(9+3) or 48/2*(9+3)