Proof: Reorder Terms 7

Let's prove the following theorem:

if x + (m∠ABC) = y, then x + (m∠CBA) = y

Proof:

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Given
1 x + (m∠ABC) = y
Proof Table
# Claim Reason
1 m∠ABC = m∠CBA m∠ABC = m∠CBA
2 x + (m∠CBA) = y if x + (m∠ABC) = y and m∠ABC = m∠CBA, then x + (m∠CBA) = y

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