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Let                                               a=b
Multiply both sides by a              axa=axb
Subtract both sides by b²           a²-=ab-
Factor                               (a+b)(a-b)=b(a-b)
Divide both side by a-b  (a+b)(a-b)/a-b=b(a-b)/a-b
Since a=b ; then,                        b+b=b
Divide both sides by b                 2b/b=b/b

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