3) х³+3х²+3х+1+х³-3х²+3х-1-2х³=12
0+6х=12
6х=12
х=2
4) 1+3у+3у²+у³+1-3у+3у²-у³-6у²=3у-1
1+3у²+1-3у+3у²-6у²=-1
2+0-3у=-1
2-3у=-1
-3у=-1-2
-3у=-3
у=1
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3) х³+3х²+3х+1+х³-3х²+3х-1-2х³=12
0+6х=12
6х=12
х=2
4) 1+3у+3у²+у³+1-3у+3у²-у³-6у²=3у-1
1+3у²+1-3у+3у²-6у²=-1
2+0-3у=-1
2-3у=-1
-3у=-1-2
-3у=-3
у=1