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September 15th, 2009, 12:49 PM   #1
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Rearrange for "a" which appears twice

I need to rearrange this eq, for "a" however i am confused as it appears twice but understand it can be done.

X= [(a-b)/c-(a-?)] * [d/e]

here is the actual equation if needed W/R=[(?fR- ?iR)/(?iW-(?fR- ?) ] * [CiR/CiW]

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September 15th, 2009, 03:38 PM   #2
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Re: Rearrange for "a" which appears twice

Do you know the method "cross-multiply"?
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September 15th, 2009, 03:40 PM   #3
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Re: Rearrange for "a" which appears twice

No its been a long time since i have had to do any thing like this...anychance of you showing me the worked eq.?
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September 16th, 2009, 02:13 PM   #4
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Re: Rearrange for "a" which appears twice

We're not supposed to do it for you, we're supposed to help you figure out how to do it.

"Cross multiply" starts with an equation like


and converts that to one without fractions:


Will that help in your problem?
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