# Learn Interfaces by Building an Equation Solver - Step 64

### Tell us what’s happening:

Whats causing the return of the solver method to be different than the solution, i have tried everything to make it to work but still it doesnt want to pass the solution, thankful for any help

### Your code so far

``````# User Editable Region

details = equation.analyze()
match details:
case {'slope': slope, 'intercept': intercept}:
details_list = [f'slope = {slope:.3f}', f'y-intercept = {intercept:.3f}']
case {'x': x, 'y': y, 'min_max': min_max, 'concavity': concavity}:
details_list = [f'concavity = {concavity}', f'min_max = ({x:.3f},{y:.3f})']
for detail in details_list:
output_string += f'{detail}\n'

# User Editable Region
``````

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### Challenge Information:

Learn Interfaces by Building an Equation Solver - Step 64

So close! Just two small details:

Then, assign `details_list` a list containing two strings with the format `concavity = <concavity>` and `<min_max> = (<x>, <y>)`, respectively.

1. See the variables have `<brackets>`, `<min_max>` is a variable here.
2. There is a space between `x,` and `y`

I knew it would something like a missing space.
Thank you so much

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