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H=3-2x[7-2x(3x+1)] +2x(5-3x).

H = 3 - 2 x [ 7 - (6 x² + 2 x ) ] + 10 x - 6 x²

H = 3 - 2 x ( 7 - 6 x² - 2 x )  + 10 x - 6 x²

H = 3 - 14 x + 12 x² + 4 x² + 10 x - 6 x²

H =   10x² - 4 x  + 3  

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