In a parallelogram, the diagonals bisect each other. This means that the segments formed by the intersection point of the diagonals (in this case, point P) are equal in length.
Since \( P \) is the midpoint of diagonals \( LN \) and \( MO \), we can express this relationship mathematically using the lengths given:
\[ LP = PN \]
According to the problem, we have:
\[ LP = 3x - 4 \] \[ PN = x + 14 \]
Setting these two expressions equal to each other, we get:
\[ 3x - 4 = x + 14 \]
Now, solve for \( x \):
- Subtract \( x \) from both sides:
\[ 3x - x - 4 = 14 \] \[ 2x - 4 = 14 \]
- Add 4 to both sides:
\[ 2x = 18 \]
- Divide both sides by 2:
\[ x = 9 \]
Thus, the value of \( x \) is \( 9 \).