х = 5 - 2х = 25, х = 3 - 3х = 27, х = - 2 - 4х = 1/16, х = - 4 - (1/2)х = 16, х = 2 - 25х= 625, х = 1 - 3х·7х = 21, х = - 3 - 2х·3х = 1/216,

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