Question 1133689
<pre>
In any triangle,

{{{matrix(1,9,
(matrix(2,1,First,angle)),
""+"",
(matrix(2,1,Second,angle)),
""+"",
(matrix(2,1,Third,angle)),
"",
""="",
"",
(matrix(2,1,180,degrees)) )}}}

So, if all you want is just the Third angle, then
Just add the two given angles 65°+35°, getting 100°.
Then subtract that from 180°.

180° - 100° = 80°

So the third angle is 80°.  That's the answer!

Then the 2(x-10) is not necessary at all.

--------------------------------------------------

However, if your teacher wants you to find x, then 

2(x-10) = 80°
 2x-20° = 80°
<u>   +20°  +20°</u>
 2x     = 100°
  x     = 50°
 
Edwin</pre>