1978 AHSME Problems/Problem 20

If $a,b,c$ are non-zero real numbers such that $\frac{a+b-c}{c}=\frac{a-b+c}{b}=\frac{-a+b+c}{a}$ , and $x=\frac{(a+b)(b+c)(c+a)}{abc}$ , and $x<0$ , then $x$ equals

$\textbf{(A) }-1\qquad \textbf{(B) }-2\qquad \textbf{(C) }-4\qquad \textbf{(D) }-6\qquad \textbf{(E) }-8$

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1978 AHSME Problems/Problem 20

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