How do you simplify #(21-3)-(4+2)+(3+5)# using PEMDAS?
We must solve in the PEMDAS order. There are three sets of parentheses, so let's solve for those:
We now have
There's no exponents, multiplication, or division. Next up is addition:
From here it's simple subtraction:
There are 3 terms, each must simplify to a single answer which will be simplified in the LAST step.
Note that this is NOT!
We may not add in parentheses where we think they belong.
The additions are