Ответ:
7b²-7a²-9b+9a=49b-49a-9b+9a=49b-9b-49a+9a=40b-58a
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Ответ:
7b²-7a²-9b+9a=49b-49a-9b+9a=49b-9b-49a+9a=40b-58a