Answer:
10
Explanation:
Remark
Technically, we can't. We have no way of knowing what kind of figure we are working with. We can say to you that if this is not at least a parallelogram then no answer is possible.
Opposite sides of a parallelogram are equal.
Equation
2x = x + 5
Solution
Subtract x from each side
2x - x = 5
x = 5
HE = 2x
HE = 2*5
HE = 10