On the extremely rare occasion when I have the misfortune to be performing a mathematical calculation, I take enormous pleasure in carrying out the operations exclusively left to right unless indicated otherwise by brackets, which is the correct way to indicate this. If you want me to do a calculation separately, put brackets around it or bugger off. It’s your choice, really
I literally just said I enjoy doing calculations incorrectly because I dislike the method of notation so much that I reliably and deliberately choose to misinterpret it every time.