If your wondering where 180 came from i'll tell you . 180 is the sum of all of it because it's a straight line and every time you have something like this it will be 180.
So then subtract 35 from 180 which will be 145
5x=145
Divide by 5 on both sides to get the answer of 29
x=29
<h2> im not a teacher but i hope this helps :) </h2>
