Proof: Double to Half

Let's prove the following theorem:

if a + a = b, then a = b ⋅ (1 / 2)

Proof:

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Given
1 a + a = b
Proof Table
# Claim Reason
1 a ⋅ 2 = b if a + a = b, then a ⋅ 2 = b
2 a = b ⋅ (1 / 2) if a ⋅ 2 = b, then a = b ⋅ (1 / 2)

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