To find the value of 'X' all you need to do is divide both sides of the equation by 6.
So,
6X = 2/3
(6X)/6 = (2/3)/6
(6/6)X = 2/(3×6)
X = 2/18
You can simplify this by looking at what common factors (numbers that both 2 and 18 can both be divided by) they have.
So since 2 and 18 can both be divided by 2:
X = 2/18
X = (1×2)/(9×2)
X = 1/9