If b1 = b2, then b1 = b2, which implies a1 = a2. If a 1 ≠ a2 and b1 ≠ b2 , then ⎧ │ ⎨ │ ⎩ b1−b2 = a2 −a1 ≠0 b1+b2=(b1+ b2)⋅b1 − b2 b1 −b2 ...
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