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It is given that alpha, beta are roots o...

It is given that `alpha`, `beta` are roots of equation `x^2 + 2ax + 3 = 0` and `gamma`, `delta` are roots of equation `x^2 + 7x + 5=0`. If `(alpha-gamma)(alpha-delta)(beta-gamma)(beta-delta)` is minimum, then `[a]` is equal to (where `[.]` denotes greatest integer function)

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