Proof: Add Number to Both Sides 2

Let's prove the following theorem:

if 90 + a = 180, then a = 90

Proof:

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Given
1 90 + a = 180
Proof Table
# Claim Reason
1 90 + a = a + 90 90 + a = a + 90
2 a + 90 = 180 if 90 + a = a + 90 and 90 + a = 180, then a + 90 = 180
3 a = 90 if a + 90 = 180, then a = 90

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