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( 12x - 8x^2 + 6 ) - ( - 8x^ 2 - 3x + 4 )
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( 12x - 8x^2 + 6 ) - ( - 8x^ 2 - 3x + 4 )

User M Dunbavan
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\begin{gathered} (12x-8x^2+6)-(-8x^2-3x+4) \\ 12x-8x^2+6+8x^2+3x-4 \\ (-8x^2+8x^2)+(12x+3x)+(6-4) \\ (0x^2)+(15x)+(2) \\ 15x+2 \end{gathered}

User Crazy Yoghurt
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