х - 2у - 3х + 5у = 3у - 2х
8,7 - 2m + n - 1/3m + 2/3n = 8,7 + 1 2/3n - 2 1/3m
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х - 2у - 3х + 5у = 3у - 2х
8,7 - 2m + n - 1/3m + 2/3n = 8,7 + 1 2/3n - 2 1/3m