x-aa2-b2=x-bb2-a2
⇒x-aa2-b2=x-b-a2-b2
⇒x-aa2-b2=-x-ba2-b2
⇒x - a = - (x - b)
⇒x - a = - x + b
⇒x + x = a + b
⇒ 2x = a + b
⇒ x = a+b2
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