Let R1 and R2 are the remainders when the polynomials x3+2x2-5ax-7 and x3+ax2-12x+6 are divided by x+1 and x-2 respectively. If 2R1+R2, find the value of a.

Let R1 and R2 are the remainders when the polynomials $x^{3} + 2 x^{2} - 5 a x - 7$ and $x^{3} + a x^{2} - 12 x + 6$ are divided by x+1 and x-2 respectively. If 2R1+R2, find the value of a.

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