can someone please show me the step-by-step explanation

Answer:
x = 4
EFH = 21°
EFG = 83°
Step-by-step explanation:
EFH + HFG = EFG
(5x + 1) + 62 = (18x + 11)
solve for x:
62 = (18x + 11) - (5x + 1)
62 = 13x + 10
62 - 10 = 13x
52 = 13x
x = 52/13 = 4