You have a straight line, cut by another creating angles...u do 180 - 130 which is 50, that's the inside angle, and 180 - 134 which is 46, another inside angle so u add the inside angle, 50 + 46 =96 we have the sum of 2 angles out of 3 in the triangle so we move on to get the final angle of the triangle. 180 - 96 = 84. X is the outside of that last angle we found so 180 - 84 = x = 96