After you have done P and E just go from left to right doing any M or D as you find them. This means that if in a mathematical expression a subexpression appears between two operators the operator that is higher in the above list should. The order of these operations states which operations take precedence are taken care of before which other operations.
102 7.
A ddition and S ubtraction left-to-right Divide and Multiply rank equally and go left to right. So addition and subtraction are all the same level in order of operations you should go left to right. The order of operations which is used throughout mathematics science technology and many computer programming languages is expressed here. This example contains parentheses exponents multiplication division addition and subtraction.