1) 6a²-7a+5-4a²+4a-16= 2a²-3a-11
2) 2x+9-x²+12x-29= -x²+14x-20
3) 10y²-6y+6+11y-y³-5= -y³+10y²+5y+1
4) a³+2a²-a-1-a²+a+4-a³= a²+3
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1) 6a²-7a+5-4a²+4a-16= 2a²-3a-11
2) 2x+9-x²+12x-29= -x²+14x-20
3) 10y²-6y+6+11y-y³-5= -y³+10y²+5y+1
4) a³+2a²-a-1-a²+a+4-a³= a²+3