Answer
a = 135
b = 135
c = 135
d = 45
x = 45
y = 45
z = 135
Work Step by Step
w = 45
a = 180 - w = 180 - 45 = 135
x = w = 45
b = a = 135
y = w = 45
c = a = 135
d = y = 45
z - c - 135
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