For the following reasoning question, solve it following these steps by generating Python code
1. State the number of variables required as the first comment line
2. Declare all the variables required as x1, x2, x3.. so on. For each variable declaration, describe clearly what the variable describes as a separate line comment.
3. Define the function def solve and pass in all the variables as parameters.
4. Write the function as required, after each line of python code, add a comment describing your intermediate thought process for that step
5. Return the final answer.
Question: There are 79 pencils in a box. NAME_1 takes 4 pencils. How many are left? Provide your response in exactly 3 paragraphs (separated nearby paragraphs with 3 aterisk symbols ***).
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