Let's solve the equation \((-x) - 4 + 4x\) for \(x = 3.9\).

Given:
\[
(-x) - 4 + 4x
\]
Substitute \(x = 3.9\) into the equation:

\[
-(3.9) - 4 + 4(3.9)
\]

Now, calculate step by step:

1. \(-3.9\)
2. \(-4\)
3. \(4 \times 3.9 = 15.6\)

So, the expression becomes:

\[
-3.9 - 4 + 15.6 = -7.9 + 15.6 = 7.7
\]

Therefore, the value of the expression when \(x = 3.9\) is \(7.7\).

Would you like more details or have any questions about this solution?

Here are five related questions:
1. What is the value of \((-x) - 4 + 4x\) when \(x = -2\)?
2. How does changing the sign of \(x\) affect the expression \((-x) - 4 + 4x\)?
3. Can you find the general form of the expression \((-x) - 4 + 4x\) after simplifying it?
4. What happens to the expression \((-x) - 4 + 4x\) if the coefficient of \(x\) is doubled?
5. What is the solution to the equation \((-x) - 4 + 4x = 0\)?

**Tip:** Always simplify algebraic expressions as much as possible before substituting values to make calculations easier.

Learn how to solve the equation (-x) - 4 + 4x when x = 3.9 with a step-by-step solution. This problem involves simplifying algebraic expressions and substituting values into equations. Suitable for students in Grades 7-9.

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