hwo can i fix the errors below

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Abdulrahman Al Ali 2019-2-24

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回答： Naman Bhaia 2019-2-27

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madhan ravi 2019-2-24

Just remove C.

Abdulrahman Al Ali 2019-2-24

I already tried removing C it didnt fix my problem

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Naman Bhaia 2019-2-27

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Hey Abdulrahman,

Based on what I can understand I think there is a logical error in the 15th line of your code. F_of_u is a function of x and not u_of_x. Therefore there is nothing the subs command can replace. Also if needed you can refer to the documentation for the subs() function.