Answer:

4d-11e

Step-by-step explanation:

You just have to subtract the sum from the given so:
=(11d-7e)-(7d+4e)
you can change the sign to addition but the (7d+4e) has to reverse their sign
=(11d-7e) + (-7d-4e)
then combine like terms
=11d-7d-7e-4e
=4d-11e