# Check for missing argument or incorrect argument data type in call to function 'solve'. error

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Aleem Andrew on 21 Feb 2021
Answered: Deepak Meena on 26 Feb 2021
I am trying to solve for a variable using the solve command. I know I can do so symbollically, but I want to first intiailize the variable and then solve for it since I am using an iterative approach to solve a problem and the variable's value is updated at the end of each iteration. When I execute the code below I get an error message. Can someone explain how this can be done?
a = 0;
a = solve(a+2==5)
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### Answers (1)

Deepak Meena on 26 Feb 2021
Hi Aleem,
Refer to this solve documentation. Here as you can need to define a as the symbolic variable fThis
Here is an example
>> syms a
a = solve(a+2==5)
a =
3
>>
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