Ответы на вопрос:
5c + 2c - 13c = 9/6 +2/7 + 1/2 -6c = 63/42 + 12/42 + 21/42 -6c = 96/42 -6c = 16/7 c = 16/7 : (-6) c = 16/7 * (-1/6) c = - 8/21
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