Proof: Remove One 2

Let's prove the following theorem:

if not (a = 0), then (1 / a) ⋅ (a ⋅ x) = x

Proof:

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Given
1 not (a = 0)
Proof Table
# Claim Reason
1 ((1 / a) ⋅ a) ⋅ x = x if not (a = 0), then ((1 / a) ⋅ a) ⋅ x = x
2 ((1 / a) ⋅ a) ⋅ x = (1 / a) ⋅ (a ⋅ x) ((1 / a) ⋅ a) ⋅ x = (1 / a) ⋅ (a ⋅ x)
3 (1 / a) ⋅ (a ⋅ x) = x if ((1 / a) ⋅ a) ⋅ x = x and ((1 / a) ⋅ a) ⋅ x = (1 / a) ⋅ (a ⋅ x), then (1 / a) ⋅ (a ⋅ x) = x
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