In the bracket itself we have 2 different operations subtraction and multiplication. It is an essential mathematical concept used in an array of places where you need to solve complex equations. It is the order of how Microsoft Excel works out how to perform the order of calculations.
This is followed by the operations on multiplication or division from left to right whichever comes first.
BODMAS is the order in which the elements of an arithmetic expression are evaluated. Finally the operations on addition or subtraction are performed from left to right whichever comes first. After you have done B and O just go from left to right doing any D or M as you find them. It is the order of how Microsoft Excel works out how to perform the order of calculations.