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tonb
The top corner is 180-78=102°
Sum of the corners should be 180°, so

39+102+5z+4=180 => 5z = 180-145 => z=35/5=7°

my previous answer of 29 was indeed wrong!!!
sorry for that!!
choixongdong
straight angle = 180
so 180 - 78 = 102

sum of interior angles in a triangle = 180
102 + 39 + 5z + 4 = 180
5z + 145 = 180
5z = 35
  z = 7

answer
x = 7

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