Ответ:
2ab-3(b(4a-1)-b(6-10a))+7b = 2ab - 42ab + 21b + 7b = -40ab + 28b = -4ab + 7b.
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Ответ:
2ab-3(b(4a-1)-b(6-10a))+7b = 2ab - 42ab + 21b + 7b = -40ab + 28b = -4ab + 7b.