C is a point on the minor arc Ab of the circle, with centre O. Given ∠ACB=x° and express y in terms of x. Calculate x, if ACBO is a parallelogram.

C is a point on the minor arc Ab of the circle, with centre O. Given $∠ A C B = x °$ and express y in terms of x. Calculate x, if ACBO is a parallelogram.

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