(a ⋅ 2) + (a ⋅ 2) = a ⋅ 4

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• (a ⋅ 2) + (a ⋅ 2) = a ⋅ 4,

  if the following are true:

  • a = b
  • b = c

  then a = c

  • a ⋅ (2 + 2) = a ⋅ 4,

    if a = b, then c ⋅ a = c ⋅ b

    • 2 + 2 = 4, 2 + 2 = 4
  • (a ⋅ 2) + (a ⋅ 2) = a ⋅ (2 + 2), (a ⋅ b) + (a ⋅ c) = a ⋅ (b + c)