Answer:
x = 42°
Explanation:
straight line angles:
m∠AOB = 180° {AB is a straight line}
m∠AOE + m∠EOF + m∠FOB = ∠AOB
x + 2x + 34 + 20 = 180°
Combine like terms,
3x + 54 = 180
subtract 54 from both sides,
3x = 180 - 54
3x = 126
Divide both sides by 3
x = 126 ÷ 3
x = 42°