PEMDAS
Parentheses First
Exponents
Multiplication and Division
Addition and Subtract
So parentheses get priority.
e.g.: (5 - 1) x (4 - 2 ) = 4 x 2 = 8
In this case, you do what is inside the parentheses first, even though it's subtraction.
Nested (inside each other) parentheses go with the inner most parentheses first.
e.g.: ( 3 + ( 8 - 2 ) x 3 ) = ( 3 + 6 x 3 ) = 3 + 18 = 21
The basic rule here is to always solve what is inside the parenthesis first.
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