CB would be equal to CK because of the CPCTC (congruent parts of congruent triangle are congruent) Theorem.
5x - 3 = 3x + 1
Add 3 to both sides.
5x = 3x + 4
Subtract 3x from both sides.
2x = 4
Divide both sides by 2.
x = 2
D) 2
