Answer:
4
Step-by-step explanation:
4d + 1 = 17
1 + 4d = 17
Move all terms containing d to the left, all other terms to the right.
1 + -1 + 4d = 17 + -1
0 + 4d = 17 + -1
4d = 17 + -1
4d = 16
d = 4
