Respuesta :

Order of operations,In mathematics and computer programming, the order of operations (or operator precedence) is a collection of rules that define which procedures to perform first in order to evaluate a given mathematical expression.P

Parentheses first

E

Exponents (ie Powers and Square Roots, etc.)

MD

Multiplication and Division (left-to-right)

AS

Addition and Subtraction (left-to-right)

Hope it helped ;3


first she expanded the bracket
then she simplified
then she added 36 to both sides
she then divided 60 by 12 to find x