2х + 3у - 5х + 8 - 4у - 12 = -3х + 3у +8 -4у - 12 = -3х - у - 4
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2х + 3у - 5х + 8 - 4у - 12 = -3х + 3у +8 -4у - 12 = -3х - у - 4