Ответ:
=2 x + 5/42 y - (4/5 x - 6/7 y) =
=2 x + 5/42 y - 4/5 x + 6/7 y =
= 6/5 x + 41/42 y
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Ответ:
=2 x + 5/42 y - (4/5 x - 6/7 y) =
=2 x + 5/42 y - 4/5 x + 6/7 y =
= 6/5 x + 41/42 y