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This is a differential equation of the form:
\[
(x - 2y - 3) \, dx + (2x + y - 1) \, dy = 0.
\]

To solve this, we need to check if it is an exact differential equation. For an equation of the form \( M(x, y) \, dx + N(x, y) \, dy = 0 \), it is exact if \(\frac{\partial M}{\partial y} = \frac{\partial N}{\partial x}\).

Here, we have:
- \( M(x, y) = x - 2y - 3 \)
- \( N(x, y) = 2x + y - 1 \)

### Step 1: Compute Partial Derivatives
1. \(\frac{\partial M}{\partial y} = \frac{\partial}{\partial y} (x - 2y - 3) = -2\)
2. \(\frac{\partial N}{\partial x} = \frac{\partial}{\partial x} (2x + y - 1) = 2\)

Since \(\frac{\partial M}{\partial y} \neq \frac{\partial N}{\partial x}\), the equation is **not exact**.

### Step 2: Integrating Factor
To make this equation exact, we may look for an integrating factor. Since it's often complex to determine by inspection, possible integrating factors are typically functions of \(x\) or \(y\) alone, or some specific form that simplifies the equation.

Would you like me to explore possible integrating factors, or attempt an alternative method such as separation of variables if applicable? Let me know if you need detailed steps for either approach! 

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### Related Questions:
1. What is the significance of an exact differential equation?
2. How can integrating factors help solve non-exact differential equations?
3. What are alternative methods to solve this type of differential equation?
4. Can this equation be solved by separation of variables?
5. Why is it important to check exactness in differential equations?

### Tip:
When dealing with non-exact equations, an integrating factor can often simplify the process by turning it into an exact equation.

Solve the differential equation \((x - 2y - 3) dx + (2x + y - 1) dy = 0\).

Explore a step-by-step solution to solve the differential equation (x - 2y - 3) dx + (2x + y - 1) dy = 0. Learn about exactness conditions, partial derivatives, and how to apply integrating factors for non-exact equations. This problem is suitable for students at the undergraduate calculus level.

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