Answer:
x = 52
Explanation:
The total angle of triangle is 180°, so we can find the Q angle first.
180 = 34 + 90 + Q
180 = 124 + Q
Q = 56°
The PQR line has 180° angle, so :
180 = 56 + (x + 72)
180 = x + 128
x = 52°
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Hopefully it helps!