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Let D1=|[a, b, a+b], [c, d, c+d], [a, b,...

Let `D_1=|[a, b, a+b], [c, d, c+d], [a, b, a-b]|` and `D_2=|[a, c, a+c], [b, d, b+d], [a, c, a+b+c]|` then the value of `|(D_1)/(D_2)|`, where `b!=0` and `a d!=b c ,` is _____.

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