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Решите уравнение

1) 2х (х-5) + 5=х
2) (2х-1)^2 + 5х = 3х^2 + 7
3) (х-2)^2 + (х+2)^2 = 3х+7
4) (2х-3)^2 - 4 = х (х-4)
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