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According to the order of operations, first we solve the exercise within parentheses:
Now we obtain the exercise:
We open the parentheses, remember to change the corresponding sign:
\( 100-(30-21)= \)
The order of operations (PEMDAS) is a universal math rule! Parentheses always come first, no matter what. Think of parentheses as a package - you must unwrap it completely before using what's inside.
When you see , think of it as moving further left on the number line. Start at -45, then move 18 more spaces left to reach -63.
You probably calculated -45 - 8 + 10 instead of solving the parentheses first! Remember:
Yes! Remember PEMDAS: Please Excuse My Dear Aunt Sally
We start with -45 (already negative) and then subtract 18 more. Subtracting makes negative numbers even more negative! Think: if you owe $45 and then spend $18 more, you now owe $63.
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