Answer:
D.

Explanation:
Let N represent the number.
We are asked to find the equation that satisfies the given description.
8 times the number would be
.
The sum of eight times a number and seven would be
.
Twice the number would be
.
To find our required equation, we will equate the sum of eight times a number and seven to twice the number as:

Therefore, option D is the correct choice.