Ответы на вопрос:
4/5 - 2/3а = 8/7 : 48/35, 4/5 - 2/3а = 8/7 * 35/48, 4/5 - 2/3а = 5/6, 2/3а = 4/5 - 5/6, 2/3а = 24/30 - 25/30, 2/3а = -1/30, а = -1/30 : 2/3, а = -1/30 * 3/2, а = -1/20, проверка: 4/5 - 2/3*(-1/20) = 8/7 : 48/35, 4/5 + 2/60 = 8/7 * 35/48, 48/60 + 2/60 = 8/7 * 35/48, 50/60 = 5/6, 5/6 = 5/6
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