first you will do dispurtive property.
8.2× D = 8.2d. 8.2×87.8=719.96
next you will write your equation down
8.2d+719.97+-61=42.96
you want the variable to be on the LEFT side so to isolate the variable you want to subtract the 719.97+-61= 658.97
now you bring the 658.97 to the right side.
42.96+658.97=701.93
now you divide
85.60