The transversal EF has effectively created corresponding and alternate angles along both parallel lines.
Also angle EGB and angle BGH equals 180, (Angles on a straight line sum up to 180 degrees). Therefore;
EGB + BGH = 180
130 + BGH = 180
BGH = 180 - 130
BGH = 50
Note also that angle BGH and angle CHE are alternate angles. Alternate angles are equal, therefore angle CHE is 50. Hence;