It appears that you've uploaded an image of a whiteboard containing a system of equations. I will analyze the visible equations and provide a solution.

Let's break down what we can see clearly:

1. The equation starts with: $17C - 8C - 26 + 4C + 20C - 4E - 25E = \text{(something)}$

2. Then there's another equation: $7C - (21d) - 20E = \text{(something)}$

These are parts of a system of equations. Let me analyze and solve these step by step. I'll begin by simplifying each equation.

First Equation Simplification:

We have the equation: $17C - 8C - 26 + 4C + 20C - 4E - 25E = ?$ Combine like terms: $(17C - 8C + 4C + 20C) + (-4E - 25E) - 26$ $= 33C - 29E - 26$

Second Equation:

The second equation is: $7C - (21d) - 20E = ?$

This equation is already simplified.

System of Equations:

Now we have two simplified equations:

1. $33C - 29E - 26 = ?$
2. $7C - 21d - 20E = ?$

It seems some parts of the equation are still missing from the image. Could you confirm or clarify the parts that are unclear so we can proceed with a more detailed solution?

Let me know if you'd like me to work further on these, and I can solve for the variables if provided with complete equations.

Would you like more details on this?

Here are 5 related questions you might want to consider:

1. Do you know what the system is trying to solve (e.g., values of C, E, or d)?
2. Are there additional equations not visible in the image?
3. Would you like assistance with interpreting unknowns or constants in the system?
4. Is this system part of a larger word problem or applied context (e.g., physics, economics)?
5. Would you like me to attempt solving for one variable in terms of others?

Tip:

Always combine like terms in a system of equations to simplify before solving.