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A = B
A2 = AB
A2 - B2
= AB - B2
(A + B)(A - B) = B(A - B)
A + B = B
B + B = B
1 + 1 = 1
2 = 1
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No reason, just letting A = B.
Multiplying both sides by A.
Subtracting B2
from both sides.
Factoring both sides.
Dividing both sides by A - B
Substituting A = B
Dividing both sides by B.
Double Integrity
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