x = 152.
Figure out the angles of the insides of the triangle and then you'll have your answer:
First angle = (supplementary) 180 - 85 = 95
Second angle = (supplementary) 180 - 123 = 57
95 + 57 = 152
152 = the measure of angles one and two
Find the third angle
180 - 152 = 28
Angle x and angle three (28) are supplementary angles so subtract to find x:
180 - 28 = 152
