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If 4(a + 2)^2 - 9a + 2(2a^2 - 1) = 4(b +...

If `4(a + 2)^2 - 9a + 2(2a^2 - 1) = 4(b + 2)^2 - 9b+ 2(2b^2 -1)= 15` where `a, b in RR and a > b` then find the value of `8(a - b).`

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