<PRE><B>Question 901353</B>
1/R=1/s+1/t+1/x solve for s
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1/s = (1/R)-(1/t)-(1/x)
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1/s = (tx - Rx - Rt)/(Rtx)
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Invert to get:
Ans: s = (Rtx)/(tx-Rx-Rt)
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Cheers,
Stan H.
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