Proof: Reduce Addition 2

Let's prove the following theorem:

if a + a = 90, then a = 45

Proof:

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Given
1 a + a = 90
Proof Table
# Claim Reason
1 a ⋅ 2 = 90 if a + a = 90, then a ⋅ 2 = 90
2 a = 90 / 2 if a ⋅ 2 = 90, then a = 90 / 2
3 90 / 2 = 45 90 / 2 = 45
4 a = 45 if a = 90 / 2 and 90 / 2 = 45, then a = 45

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