p = 3
To solve for p, start with the distribution property.
1/4 (p-8)=10 --> p(1/4)-8(1/4) = 10
1/4p-2=10
Now, add 2 to both sides.
1/4p-2 +2 =10 +2
1/4p = 12
Finally, divide both sides by 1/4.
1/4p = 12
p = 3
Hope this helps!
Let me know if you need anything else :)