If all people did was simple equations like the one in the OP, you'd probably be right, but math syntax has to deal with all kinds of equations. Your way, I can't write 3x^2–4x+5. Instead, I'd have to write ((((3x)^2)−4)x)+5. That's WAY more obnoxious. It's better to have an unambiguous syntax that covers all the cases and lets me write equations in an more simple form.