You have to switch the sign of all terms within the parentheses. For example,
-(a - b + c - d)
becomes
-a + b - c + d
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you turn everything inside the prenthises positive or negative
A "+" before parentheses means + 1 times everything inside, so +(a+b-c) means +a+b-c
It is: 3n-21+4n+8 = 7n-13 simplified
As there are no parentheses then the expression stated can be simplified as follows :- 7x - 4x - 9 = 3x - 9 If the parentheses were placed (7x - 4x) - 9 then the result would be the same. If the parentheses were placed 7x - (4x - 9) = 7x - 4x + 9 = 3x + 9.
A spatula would be used to remove 0.25 grams of a solid material from a reagent bottle.