х²-4х+4=х²-18х+81
-4х+4=-18х+81
-4х+81х=81-4
14х=77
х=11/2 или 5,5
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х²-4х+4=х²-18х+81
-4х+4=-18х+81
-4х+81х=81-4
14х=77
х=11/2 или 5,5