Answer: LM = 6 units.
Step-by-step explanation: Given that the point M is the mid-point of the line segment LN shown in the figure.
We are to find the length of LM.
From the figure, we note that
LM = 3x and MN = 2x + 2.
Since M is the mid-point of LN, so it will divide LN in two equal parts.
That is, we must have

Therefore, we get

Thus, LM = 6 units.