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H =  ( 10 x - 5 ) ( 4 x + 6) -  ( 15 - 6 x )

H =  40 x² + 60 x - 20 x - 30 - 15 + 6 x

H =  40 x² + 46 x - 45

i =  ( 2 x + 1 )  ( 3 x + 2 x - 16)

I  = ( 2 x + 1 ) ( 5 x - 16)

I =  10 x² - 32 x + 5 x - 16

I = 10 x² - 27 x - 16

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