Em cada caso, a sequência é uma P.A. Determine o valor de x: a) (3x - 5, 3x+1, 25) b) (-6-x, x+2, 4x)?

a) (3x - 5, 3x+1, 25)

b) (-6-x, x+2, 4x)

c) x+3, x², 6x+1)

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