add: (3x²+2x-3),(5x²+6)and(4x-2)
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=(3x²+2x-3)+(5x²+6)+(4x-2)
= 3x²+2x-3+5x²+6+4x-2
= 3x²+5x²+2x+4x-3-2+6
= 8x²+6x+1
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