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simplify 4x^{2}-\frac{8x}{3}\left(2x-1\right)+\frac{8}{15}\left(2x-1\right)^{2}
simplify 4x^{2}-\frac{8x}{3}\left(2x-1\right)+\frac{8}{15}\left(2x-1\right)^{2}
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