Direction: Supply the missing reason in the following proof.

Direction: Supply the missing reason in the following proof.
Given:M∠A+m∠B=m∠B+m∠C
Prove:m∠A=m∠C
Statement:
m∠A+m∠B=m∠B+m∠C
m∠B=m∠B
m∠A=m∠C
Reason:
1.
2.
3.