Answer:
7 w - 6 w = 10 d- 8 d
1 w = 2 d
then 10w - 7w = x- 10d
3w = x - 10d............(1 w = 2 d)
3(2d) = x - 10d
x = 10d +6d
x = 16d
It is natural
Step-by-step explanation:
x=6f-7 is the correct answer.