High School

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Karissa begins to solve the equation [tex]\frac{1}{2}(x-14)+11=\frac{1}{2} x-(x-4)[/tex]. Her work is correct and is shown below.



\[

\begin{array}{c}

\frac{1}{2}(x-14)+11=\frac{1}{2} x-(x-4) \\

\frac{1}{2} x-7+11=\frac{1}{2} x-x+4 \\

\frac{1}{2} x+4=-\frac{1}{2} x+4

\end{array}

\]



When she subtracts 4 from both sides, [tex]\frac{1}{2} x=-\frac{1}{2} x[/tex] results. What is the value of [tex]x[/tex]?



A. -1

B. -\frac{1}{2}

C. 0

D. \frac{1}{2}

Answer :

We start with the given equation:

$$
\frac{1}{2}(x-14)+11=\frac{1}{2} x-(x-4).
$$

**Step 1: Expand both sides.**

On the left-hand side, distribute $\frac{1}{2}$ within the parentheses:

$$
\frac{1}{2}(x-14) = \frac{1}{2}x - 7.
$$

The left-hand side becomes:

$$
\frac{1}{2}x - 7 + 11 = \frac{1}{2}x + 4.
$$

On the right-hand side, distribute the negative sign:

$$
\frac{1}{2} x - (x-4) = \frac{1}{2}x - x + 4.
$$

Combine the like terms on the right-hand side:

$$
\frac{1}{2}x - x = -\frac{1}{2}x.
$$

Thus, the right-hand side simplifies to:

$$
-\frac{1}{2}x + 4.
$$

**Step 2: Set the simplified sides equal to each other.**

We now have:

$$
\frac{1}{2}x + 4 = -\frac{1}{2}x + 4.
$$

**Step 3: Eliminate the constant term on both sides.**

Subtract $4$ from both sides:

$$
\frac{1}{2}x = -\frac{1}{2}x.
$$

**Step 4: Solve for $x$.**

To eliminate the $-\frac{1}{2}x$ on the right, add $\frac{1}{2}x$ to both sides:

$$
\frac{1}{2}x + \frac{1}{2}x = 0 \quad \Longrightarrow \quad x = 0.
$$

Thus, the value of $x$ is:

$$
\boxed{0}.
$$

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