Solve the given equation and answer the following questions.

I. (p ×  p) - √576p = - (14² - 112/2)

II. √(424b⁴ - 100b⁴) + (132b/4) + √225 = 0

III. c² + (√(676c²))/2 = - [(5²) ×  2 - 10 ×  2]

Note:

i) If the smaller values in equation I, II and III are L, M, and N respectively.

x = (10L + (M ×  (- 5)) - (- N)% of L² + 23% of 600)

Find the value x.