5x^2+7x+3;12x^2-3x+8;6x^2-4x+6
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Answer:
4x²+x² +5x+4x+6+1+3+5x²
=5x² +9x+10+5²
=5x² +5x² +9x+10
4x² +5x+6
x² +0x+1
5²+4x+3
=5x² +5x² +9x+10
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