Answer:
x=12
Step-by-step explanation:
Cross multiply them:
84 = 7x
Divide By 7 on both sides
12 = x
And there is the answer. Sorry I couldn't explain better Im really not feeling good today
If it is (6^-4)^6 it should be 1/6^24. The picture was a bit blurry.
Hope this helps and thank you for using Brainly!
(I) 
(II) 
Get
alone in equation (II)

Insert new equation (II) in equation (I)

Insert
in equation (II)
