Looks like we are looking at a line AC where B is the midpoint.
Assuming such is the case, we know that the length of AB = 10, so AC=20 and BC = 10
Assuming, BC=2x+5 is true, we get 2x+5=10, so 2x=5, so x = 2.5
But that means AC=5x=5*2.5=12.5
But this is False since AC =20.
Hence BC=2x+5 is wrong or not possible.
Assuming such is the case, we know that the length of AB = 10, so AC=20 and BC = 10
Assuming, BC=2x+5 is true, we get 2x+5=10, so 2x=5, so x = 2.5
But that means AC=5x=5*2.5=12.5
But this is False since AC =20.
Hence BC=2x+5 is wrong or not possible.