Posted by **Sab** on Tuesday, August 28, 2012 at 11:37am.

Can someone please check my answer?

Rearrange (cp-yd)/(pd)=p+y to make d the subject

OK, I did

cp-yd=pd(p+y)

cp=pd(p+y)+yd

cp=p^d+pdy+yd

factoring out the d

cp=d(p^2+py+y)

cp/(p^2+py+y)=d

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