Помогите решить систему уравнений:
2x + 10 = 9 - 3(4 + y)
21 + 6x + 4y = 4(2x + 5)
2x + 10 = 9 - 3(4 + y)
21 + 6x + 4y = 4(2x + 5)
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2х-3у=9-12-10
2х-3у=-13