Ответы на вопрос:
2d = 6 d = 3 a₁ = 7 - 4d = 7 - 4 * 3 = 7 - 12 = - 5 a₁₀ = a₁ + 9d = - 5 + 9 * 3 = - 5 + 27 = 22
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