Summerkim....I think this is supposed to be:
2(x+1/3) = 4 (x-1) distribute the 2 and 4 across the terms in the parentheses
2x + 2/3 = 4x - 4 subtract 2x from both sides, add 4 to both sides
4 + 2/3 = 4x - 2x
14/3 = 2x multiply both sides by (1/2)
(14/3) (1/2) = (1/2)*2 x
14/6 = x = 7/3