We know that the sum is 180 so we subtract what we do know, 46 to 180.
180 - 46 = 134
Now, there are two x's we need to find the meaning of so we divide what is needed, 134 by 2.
134 ÷ 2 = 67
Alright! Now we know that each x is worth 67. If you need to double check all you need to do is add up the 67, 67, and 46 to get 180. Hope this helped! :)