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If a, b, c, d satisfy the equation a + 7b + 3c + 5d = 0, 8a + 4b + 6c + 2d = - 16, 2a + 6b + 4c + 8d =16 5a + 3b + 7c + d = -16 then the value of (a + d) (b + c) =______ |
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