When the polynomial \(x^3 + 2x^2 - 5ax - 7\) is divided by \(x + 1\), the remainder is \(R1\).
When the polynomial \(x^3 + ax^2- 12x + 6\) is divided by \(x - 2\), the remainder is \(R2.\)
If \(2R1 + R2 = 6\), find the value of a.

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