The equation of the exponential function is 
<h3>How to determine the equation?</h3>
An exponential equation is represented as:
y = b^x
Where b represents the base.
The base is 3.
So, we have:

When reflected over the y-axis, we have:

When shifted right by 5 units, we have:

Lastly, the function has an asymptote of y=-3
So, we have:

Hence, the equation of the exponential function is 
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