An object is attached to a coiled spring. The object is pulled down (negative direction from the rest position) 7 centimeters, and then released. Write an equation for the distance d of the object from its rest position, after t seconds if the amplitude is 7 centimeters and the period is 8 seconds. The equation for the distance d of the object from its rest position is. (Type an exact answer, using as needed. Use integers or fractions for any numbers in the equation.)

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