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((a^2 +b^2 +2 a b ) -c^2)/((a^2 +c^2 +2ac) -b^2)

⇒(a+b)^2 -c^2/((a+c)^2 -b^2
⇒ now we use 
one rule A^2 -B^2 =(A+B)*(A-B)

we get (a+b-c)/(a+c -c)
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