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Let's assume A=B and A>0

if we multiplie each side with A

A^2=AB

and minus B^2

A^2 - B^2 = AB - B^2

which can be put in parantesis as

(A+B).(A-B) = B(A-B)


now if we divide by A-B


A+B=B

now remember A>1 , so lets say 2

2+2=2

and yet again 2=1+1 so


1+1=4