Question

∠1 ​ and ∠2 are supplementary.

Answer 1

By definition, supplementary angles are those whose sum is 180°

Therefore, ∠2 = 180 - ∠1
2x + 4 = 180 - 124
2x = 52
x = 26°

Answer 2

124° + 2 x + 4° = 180° ( angles are supplementary )
2 x = 180° - 124° - 4°
2 x = 52°
x = 52° : 2
Answer:
x = 26°