subtract the sum of 2x2-4x+11 and 7x2-4x+1 from the sum of 8x2-7x-7 and 6x2+4x-6
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8*2-7x-7+6*2+4x-6
= 16-7x-7+12+4x-6
= 28-3x-13
2*2-4x+11+7*2-4x
= 29-8x
29-8x-28-3x-13
= 1-11x-13.
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