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Let me see.
Lines h and g meet to form congruent angles.
Lines h and g cut lines d and f.
Angle x = 35° + (180° - 120°)
Angle x = 35° + 60°
Angle x = 85°
You say?
take a look at isosceles triangle formed by lines g,h an f
base angles are same, both are x
and third angle is 35
2x+35=180
2x=180-35
2x=145
x=145/2
x=72.5