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The P in PEMDAS stands for "parenthesis!"

Parenthesis in math are used to group important things together, so you always do them first.

PEMDAS:  P = Parenthesis...  E = Exponents...  MD = Multiplication & Division...  AS = Addition & Subtraction

Check it out:

6 - ( 5 - 3 ) + 10

Do inside the parenthesis first!

6 - ( 5 - 3 ) + 10 = 6 - 2 + 10 = 4 + 10 = 14