Answer:
8d-1
Step-by-step explanation:
4d+5d-6+3d-4d+5
Combine like terms and constants.
4d+5d+3d-4d -6+5
Combine like terms, which are the terms with the d's and then the constants, which are the terms without the letters.
(4+5+3-4)d -6+5
8d -1
8d-1
