# Mesh up

Geometry Level 1

In the above figure, let $$a = \dfrac{PS\cdot QB\cdot RT}{BR\cdot TP\cdot SQ}$$ and $$b =\dfrac{ZV\cdot YW\cdot XC}{WZ\cdot VX\cdot CY}$$.

What is the value of $$a-b$$?

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