Have You Practice Your Algebra Today?

Algebra Level 2

Given a=2013x2a = 2013 - x^2 b=2014x2b = 2014 - x^2 c=2015x2c = 2015 - x^2 and abc=3abc = 3. Find the value of abc+bca+cab1a1b1c\frac{a}{bc} + \frac{b}{ca} + \frac{c}{ab} - \frac{1}{a} - \frac{1}{b} - \frac{1}{c}

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