Question 1098459
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B(2c+4) = D(8-c)
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Formula for what?  c  NOT C.



{{{2Bc+4B=8D-Dc}}}

{{{2Bc+Dc+4B=8D}}}

{{{2Bc+Dc=8D-4B}}}

{{{c(2B+D)=8D-4B}}}

...

{{{c(2B+D)(1/(2B+D))=(8D-4B)(1/(2B+D))}}}


{{{highlight_green(c=(BD-4B)/(2B+D))}}}



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This could be done in fewer steps than shown.