Ответ:
(d - 9)(d + 1) - (d + 6)(d - 14) = d² + d - 9d - 9 - (d² - 14d + 6d - 84) = d² + d - 9d - 9 - d² + 14d - 6d + 84 = -8d - 9 + 8d + 84 = -9 + 84 = -75
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Ответ:
(d - 9)(d + 1) - (d + 6)(d - 14) = d² + d - 9d - 9 - (d² - 14d + 6d - 84) = d² + d - 9d - 9 - d² + 14d - 6d + 84 = -8d - 9 + 8d + 84 = -9 + 84 = -75