Answer:
x = 5
Step-by-step explanation:
Two corresponding angles formed between two parallel lines and a third line bisecting them are equal.
[tex]23x - 5 = 21x + 5 \text{ // - 21x + 5}\\23x - 5 - 21x + 5 = 21x + 5 - 21x + 5\\2x = 10\\x = 5[/tex]
