Can you solve this Bag, Books and Newspaper puzzle?

Can you Solve this Bag, Book and Newspaper puzzle?

Only 10% people were able to solve it? Can you solve it?

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Equation 1 – 2 bags = 20
                      1 bag = 10

Equation 2 – 
                       1 bag x 2 newspaper = 20
                       10 x 2 newspaper
                       2 newspaper = 2
                        newspaper = 1

Equation 3 –
                    5 books ( Divide ) 1 newspaper = 10
                     5 books = 10
                      1 book = 2

Equation 4 – 
                    1 bag – 2 newspaper x 4 books
                      10   –    2 x 8 
                   follow BODMAS – Multiplication first and then subtraction.
                      10 – 16
                      = -6

Answer is -6