Answer: 73
Step-by-step explanation: We know that all the vertices of a triangle should add up to 180 degrees. The straight line on which 105 degrees is sitting is 180 degrees. To find that missing side(y) we do:
105+y=180
-105 -105
So y is equal to 75.
So that missing side of the top triangle is 75, and since the vertices of a triangle add up to 180 degrees, we make the equation:
32+75+x=180
107+x=180
-107 -107
x=73
X is equal to 73.