1+3y+3y²+y³+1-3y+3y²-y³-6y²-3y+1=0
y³-y³+3y²+3y²-6y²+3y-3y-3y+1+1+1=0
-3y+3=0
3y=3
y=1
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1+3y+3y²+y³+1-3y+3y²-y³-6y²-3y+1=0
y³-y³+3y²+3y²-6y²+3y-3y-3y+1+1+1=0
-3y+3=0
3y=3
y=1