Ответ:
-1/7 - (-1/14+2/21) = -6/42 - (-3/42+4/42) = -6/42 - 1/42 = -7/42 = -1/6
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Ответ:
-1/7 - (-1/14+2/21) = -6/42 - (-3/42+4/42) = -6/42 - 1/42 = -7/42 = -1/6