I am going to do this fast because I have to go, if you have questions leave a comment and I will get back to you.
2/3 = 8 - 4A (subtract 8 on both sides) (Note 8 is the same as 24/3 because 24/3 = 8)
2/3 - 24/3 = -4A
-22/3 = -4A (divide both sides by -4)
-22/3 / -4 = A (dividing is the same as multiplying by the recopicle)
-22/3 X -1/4 = A
A= 22/12 or 11/6