An algebra problem by Áron Bán-Szabó

Algebra Level 1

a+bc+d=abcd\dfrac{a+b}{c+d}=\dfrac{a-b}{c-d}

If a,b,c,da,b,c,d are integers, which of the following can be the value of a×b×c×d?a\times b\times c\times d?

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