I believe there are 35 backpacks in all. 2 closets have 6 shelves all together. Then 6*5=35.
Distributing same key numbers
-2x + 5 = -1
subtract 5 from both sides: -2x = -6
divide each side by -2: x = 3
plug in 3: 5(3)
multiply: 15
the value of 5x is 15.
You would probably find it on the altitude or height.
