x⁵+5x²-3x-(2x²+x+7)= x⁵+5x²-3x-2x²-x-7=x⁵+3x²-4x-7
x³+5x²-2x²-3x-x-7=x³+3x²-4x-7
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x⁵+5x²-3x-(2x²+x+7)= x⁵+5x²-3x-2x²-x-7=x⁵+3x²-4x-7
x³+5x²-2x²-3x-x-7=x³+3x²-4x-7