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If $$\alpha, \beta$$ are the roots of the equation $$7x^2 - 8x + 6 = 0$$ then $$(\alpha^2 + \beta^2)(\alpha + \beta) =$$
$$\frac{-20}{49}$$
$$\frac{20}{49}$$
$$\frac{-160}{343}$$
$$\frac{160}{343}$$
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