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To determine which equation is true when \( x = 4 \), we will substitute \( x = 4 \) into each equation and simplify to see if the left-hand side equals the right-hand side.

Let's evaluate each option:

**F:** \( 3x + 4 = 8 \)
Substituting \( x = 4 \):
\[ 3(4) + 4 = 12 + 4 = 16 \]
Since \( 16 \neq 8 \), this equation is **not true**.

**G:** \( 5x - 2 = 18 \)
Substituting \( x = 4 \):
\[ 5(4) - 2 = 20 - 2 = 18 \]
Since \( 18 = 18 \), this equation is **true**.

**H:** \( 2x + 8 = 40 \)
Substituting \( x = 4 \):
\[ 2(4) + 8 = 8 + 8 = 16 \]
Since \( 16 \neq 40 \), this equation is **not true**.

**J:** \( 4x + 4 = 12 \)
Substituting \( x = 4 \):
\[ 4(4) + 4 = 16 + 4 = 20 \]
Since \( 20 \neq 12 \), this equation is **not true**.

After evaluating all options, we find that the equation that is true when \( x = 4 \) is:

**G: \( 5x - 2 = 18 \)**

make it shorter

Sure! Here’s a concise evaluation of each equation for \( x = 4 \):

**F:** \( 3x + 4 = 8 \)
\( 3(4) + 4 = 12 + 4 = 16 \) (not true)

**G:** \( 5x - 2 = 18 \)
\( 5(4) - 2 = 20 - 2 = 18 \) (true)

**H:** \( 2x + 8 = 40 \)
\( 2(4) + 8 = 8 + 8 = 16 \) (not true)

**J:** \( 4x + 4 = 12 \)
\( 4(4) + 4 = 16 + 4 = 20 \) (not true)

The equation that is true when \( x = 4 \) is **G: \( 5x - 2 = 18 \)**.