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TLV9002: Finding Vcm in Single-supply strain gauge bridge amplifier circuit

Part Number: TLV9002

Hi 

Im having trouble when following the design steps (page 2 of the application note, or page 262 of  Analog Engineer’s Circuit Cookbook: Amplifiers Second Edition SLYY137 - 03/2019).

Where is this equation come from?

 

I know  Vcm = 0.5(Vex), but then how can I expand it to involve the resistances?

Thanks in advance

Fran