From the difference between 4x and 5y substact the sum of 4x and 5y??

The difference between 4x and 5y is 4x - 5y.

The sum of 4x and 5y is 4x + 5y.

Therefore, the expression we need to evaluate is:

(4x - 5y) - (4x + 5y)

Expanding the brackets, we get:

4x - 5y - 4x - 5y

Combining like terms, we get:

-10y

Therefore, the result of subtracting the sum of 4x and 5y from the difference between 4x and 5y is -10y.

(4x - 5y) - (4x + 5y)

= 4x - 5y - 4x - 5y

= -10y