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Solving exponential

Solving exponential

Price: FREE

The data below represent x and y values which fit an exponential equation
is there a way to use the solver to establish what x is when y is zero?
I need to do this for thousands of data sets like these so it needs to be fairly painless!
The answer is about 480!

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Not sure if this would be able to be solved using solver, having trouble, help greatly appreciated
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(divided by 100 both sides, ult by -4)
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