# Upside Down

Algebra Level 3

Given that $$a,b$$ and $$c$$ are non-zero numbers satisfying $$\dfrac 1a + \dfrac 1b + \dfrac1c = 0$$, calculate

$\dfrac{bc}{a^{2}} + \dfrac{ac}{b^{2}} + \dfrac{ab}{c^{2}}.$

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