Answer:
X = 4
Step-by-step explanation:
That traingle is an isosceles triangle. You know this because the base angles, 45 and 45 are the same. Another characteristic of an iscosceles traingle is that the base sides ( in this case 4 and X ) are always the same
Well first all you have to do is simplifying both sides of the equation then of course isolating the variable then you should end up with

Hopefully this helps ^0^ Mark Brain
Basically, you do 2/3-5/6
2/3-5/6=4/6-5/6=-1/6