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If (a+b)/(b+c)=(c+d)/(d+a), then...

If `(a+b)/(b+c)=(c+d)/(d+a)`, then

A

a must equal c

B

`a+b+c+d` must equal zero

C

either `a=c or a+b+c+d=0`, or both

D

`a(b+c+d)=c(a+b+d)`

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The correct Answer is:
C
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