from the sum of 3 x ki power 2 minus 5 x + 8 and minus 6 x ki power 2 + 7, subtract minus 9 x minus 1
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given (3x²-5x+8)+(-6x²+7)
=3x²-5x+8-6x²+7
=-3x²-5x+15
now a/q
(-3x²-5x+15)-(-9x-1)
=-3x²-5x+15+9x+1
=-3x²+4x=16 is your answer
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