To solve the equation \( 9x + 4 = 7x + 4 \), follow these steps:

1. Subtract \( 7x \) from both sides to get the variable terms on one side:
   \[
   9x - 7x + 4 = 4
   \]
   This simplifies to:
   \[
   2x + 4 = 4
   \]

2. Subtract 4 from both sides to isolate the \( 2x \) term:
   \[
   2x = 0
   \]

3. Finally, divide both sides by 2 to solve for \( x \):
   \[
   x = 0
   \]

The solution is \( x = 0 \).

Would you like further details or have any questions?

Here are five related questions:
1. What happens if the constant on the right side changes?
2. Can you solve \( 9x + 5 = 7x + 3 \)?
3. How do you solve \( 9x + 4 = 7x + 6 \)?
4. How would this change if it were an inequality, like \( 9x + 4 \geq 7x + 4 \)?
5. How do you solve \( 9x + 4 = 0 \)?

**Tip**: Always simplify both sides of an equation as much as possible before moving terms.

Learn how to solve the linear equation 9x + 4 = 7x + 4 with a step-by-step breakdown. This problem focuses on simplifying algebraic expressions and isolating the variable to find the solution, suitable for students in Grades 6-8.

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