х1=9, х2=-3
проверка
I9-3I=6
I6I=6
6=6 верно
I-3-3I=6
I-6I=6
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х1=9, х2=-3
проверка
I9-3I=6
I6I=6
6=6 верно
I-3-3I=6
I-6I=6
6=6 верно