# Solve for x

### Solve for x

I need to solve this equation for x. Can anyone help?

$$y=\frac{1}{8}x(x-1)+75\frac{2^{(x-1)/7}-1}{1-2^{\frac{-1}{7}}}+ax$$
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### Re: Solve for x

We cannot solve this unless a value for a is given
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### Re: Solve for x

I think a-parameter,then y-should not have.
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