step 1
Find out the measure of angle z
we have that
52+z=180 degrees ----> by forming a linear pair
z=180-52
z=128 degrees
step 2
Find out the measure of the third interior angle of the triangle on the left
we have that
45+50+third angle=180 degrees
third angle=180-95
third angle=85 degrees
step 3
Find out the measure of angle x
we have that
third angle+x=180 degrees --> by forming a linear pair
85+x=180
x=180-85
x=95 degrees
step 4
Find out the measure of angle y
we have that
x+52=y -----> by exterior angle theorem
95+52=y
y=147 degrees