Using pemdas what’s is the solution?

2/3 - 5/6 (8-1/6) + 1/2

do the inside parenthesis

2/3 - 5/6 (7 5/6) + 1/2

change to an improper fraction ( 7 5/6 = (6*7+5)/6 =47/6)

2/3 - 5/6 * (47/6) + 1/2

2/3 - 5/6 * 47/6 + 1/2

2/3 - 235/ 36 + 1/2

get a common denominator of 36

2/3 *12/12 -235/36 + 1/2 *18/18

24/36 -235/36 + 18/36

(24-235+18)/36

-193/36

change to a mixed number

36 goes into 193 5 times with 13 left over

-5 13/36

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225