You went to the store to get buy school supplies! You purchased binders, notebooks and pencils In total, the 47 items you bought cost $105 and you bought 3 times as many notebooks as you did
binders. A binder costs $3.50, a notebook costs $2.25, and a pencil costs $1.75. How many of each
item did you purchase?

Step 1. When there is a in front of an expression in parentheses, change the sign of each term in the expression-> -11 + 5 - 9 - (-13) - (-5)
Step 2. When there is a in front of an expression in parentheses, change the sign of each term in the expression-> -11 + 5 - 9 + 13 - (-5)
Step 3. When there is a in front of an expression in parentheses, change the sign of each term in the expression -> -11 + 5 - 9 + 13 + 5
Step 4. Calculate the sum or difference
The ANSWER is 3 .