Answer:
5 units.
Step-by-step explanation:
See the given diagram of the triangle.
Here, WR = RT and WQ = QX
Therefore, R is the midpoint of WV and Q is the midpoint of WX.
Now, we know that if we join the midpoints of two sides of a triangle then the line formed will be parallel to the third side and will be half of the third side.
Hence, 2× QR = XV
⇒ 2(2x - 7) = - 2 + 2x
⇒ 4x - 14 = - 2 + 2x
⇒ 2x = 12
⇒ x = 6
Therefore, QR = 2x - 7 = 12 - 7 = 5 units. (Answer)
