There will be no lock, if you don’t like math stay out.
No because in your own example if it’s
48/2*3(3+1)
It becomes 72(3+1) going left to right
So you’re proving yourself wrong by saying that 3 will be assigned to the parenthesis and don’t out of order of left to right, but somehow that 2 isn’t assigned???
It doesn’t matter what sign is in front, the rule is the rule, distributive property states that it’s equivalent of (18+6) with 2 factored out making it (9+3) and two sitting outside.
That’s why it can be written as 48/(9+3)2 and still be right.